All categories/Fishing & Aquariums/Aquariums/Fluval/AquaClear 70 Power Filter
AquaClear 70 Power Filter

AquaClear 70 Power Filter

Scored on 22 verified owner verdicts, from 54 comments read across 4 communities
TL;DR
Owner consensus on the AquaClear 70 is strongly positive: most treat it as the gold-standard hang-on-back filter, with several longtime fishkeepers switching over from other brands like Aqueon and reporting units that have run reliably for years, even decades. A meaningful minority push back on two specific issues, though: the filter can be stubborn about restarting after a power cut or once the impeller gets grimy, sometimes needing repriming or refusing to cycle water at all, and its outflow runs strong enough out of the box that some owners had to reconfigure it or pull it off planted tanks to stop it from thrashing their plants. Even critics tend to frame these as manageable quirks rather than dealbreakers, and the filter's flexible media chamber and canister-like customization keep coming up as a bonus few HOB filters offer.

45% of 22 verified owners recommend the AquaClear 70 Power Filter, based on real owner verdicts aggregated from Reddit, enthusiast forums, and YouTube.

See the problems 3 owners report →

What 22 owners say
54 comments reviewed · scored on the 22 clearest verdicts
45%
Recommend
10 owners
41%
Neutral
9 owners
14%
Don't recommend
3 owners
Source
Score
N
Counted in the score
Reddit
50%
16
Other forumsFishforums, Monster Fish Keepers
33%
6
Reviewed, but not counted — and why
Affiliate blogsipaid commission
100%
2
No clear verdictiSetup, tips & quirks
22

Affiliate blogs here say 100% recommend, while the owner-based score is 45%. They earn a commission on every sale — so we show them for transparency but never let them move the score.

The headline score reflects owners (Reddit, enthusiast forums), independent lab tests, blogs with no affiliate links, and YouTube owner-comments when they line up with owners. Affiliate blogs is shown for perspective but kept out here — hover the i for why.

What owners like
  • Widely regarded as the best hang-on-back filter on the market, with several owners switching from brands like Aqueon and saying they'll never go back · 5 · 23%
  • Extremely reliable and long-lasting, with some units still running decades after purchase (one owner still runs an AquaClear 70 from 1990) · 4 · 18%
What owners flag
  • Can be finicky to restart after a power outage or once the impeller gets dirty, sometimes needing repriming or grinding/failing to cycle water at all · 4 · 18%
  • Outflow is quite strong out of the box and often needs configuring to tame, with a few owners removing it from planted tanks because it was blasting their plants · 3 · 14%
Who it's for
A great fit if
  • Owners who want a customizable media chamber, similar to a canister filter but cheaper
  • Planted or reef HOB setups running refugium media like chaeto, floss, and purigen
  • Aquarists prioritizing reliable long-term mechanical and biological filtration over years of use
  • Tanks needing strong flow and surface agitation, like sponge- or gravel-based freshwater setups
Look elsewhere if
  • Owners intolerant of occasional repriming or restarting after power interruptions
  • Delicate planted tanks where strong outflow can damage or uproot plants
  • Anyone wanting a low-maintenance filter, since cleaning and impeller upkeep are frequent complaints

Synthesized from what AquaClear 70 Power Filter owners say — not a spec sheet.

Top quotes, sourced

54 reviewed · 24 shown
Sentiment
Community
Sort
Reddit▲ recommend

I still have an old AquaClear70 from 1990 that I still run

Reddit— neutral

the outflow was just too strong without a lot of configuring

Reddit▼ don’t recommend

Ran it completely empty, i.e. no filter media or sponge, and it still shut off randomly.

Reddit▼ don’t recommend

I got so frustrated with that thing constantly giving me issues, impeller grinding etc., and it would NOT cycle my water!

Reddit▲ recommend

it works great but the flow is pretty strong

Reddit— neutral

provides enough ripple across the surface without splashing

Reddit▲ recommend

Aquaclear's are the best HOB available

Reddit— neutral

the return causes microbubbles

Reddit▼ don’t recommend

the odds of it starting after a break in power, seems to lower as the impeller gets dirtier

Fish Forum— neutral

The Aquaclear's mesh bag is functional, but just seems cheap, being a plastic mesh tube, heat sealed on one end, with a cheap plastic clip for the other

Reddit▲ recommend

nice because you can basically put whatever you want in the filter chamber, similar to a canister filter but cheaper.

Reddit— neutral

these filters are weird that way. Sometimes it takes repriming and restarting a time or two, for them to run again

Reddit▲ recommend

is the best HOB setup I have ever used. Tan this on my old 20L and it was bulletproof.

Fish Forum— neutral

I took an Aquaclear 70 off my 75 as the flow was so strong, it was ravaging my plants.

Reddit▲ recommend

got very good mechanical filtration for an aquarium.

Fish Forum— neutral

other than that it's an awesome filter but I dread filter cleaning item.

Reddit▲ recommend

its been running like a champ

Tropical Fish Care Guides (affiliate)▲ recommend

The AquaClear 70 is a game-changer for any aquarium setup and has significantly benefited my aquarium setup in several ways.

MonsterFishKeepers— neutral

The aq70 is The better biofilter and a lot easier to maintenance.

MonsterFishKeepers▲ recommend

I just recently replaced both of my Aqueon 55/75's with AC 70's, I wish I had done it much sooner.

Reddit— neutral

does an adequate job of filtering water

Reddit▲ recommend

after testing and using almost all HOB filters, I exclusively use AquaClears

Modest Fish (affiliate)▲ recommend

I know from experience that the AquaClear is simple and reliable.

MonsterFishKeepers▲ recommend

Ac are awesome, IME best hob on the market for the price!

Common problems & things to know

Practical notes owners raise — setup, quirks, and issues to watch for. They don't say whether the person likes the product, so they're not counted in the score, but they inform the pros, cons, and who it's for.

Redditⓘ good to know

Just before bed, I would put 2.5 gal in a pot on the woodstove to heat it, not to boil, and poured it back in to warm the tank. It never went below 70F, partly due to the woodstove. I only fed the fish twice during the outage.....minimal granules.

Redditⓘ good to know

Haha thanks! I wish I could get some high tea pics! Very simple set up. Aquaclear70 HOB with purigen and chemipure and a bit of filter floss. Orbit Marine Pro Led. MP10 quiet drive. Smart ATO. I dose two part daily.

Redditⓘ good to know

My 40g had no canisters but had an Aquaclear70 and Aquaclear50, and I'll soon be adding an entry level Eheim cannister to that.

Redditⓘ good to know

I am also very new to different kind of filters however I've been researching for myself recently. I think going for a bigger size with a material cheaper than glass is smart, your turtle is going to be happy. Just make sure that the container is durable and healthy.

Redditⓘ good to know

FYI, Fluval bought aquaclear. It's now something like "aquaclear by Fluval". My aquaclear70 says fluval on the lid.

Redditⓘ good to know

I am using aquaclear70 for filtration. Subtrate is pool filter sand. For CO2, I use a powerade bottle with yeast and sugar mixed, air tube has end of chop stick shoved in, that bubbles up into output flow of filter. I use Flourish once a week and Excel twice a week.

Redditⓘ good to know

I started with two. Lotls have a large bioload. When i upgraded to a 60 gallon,(he grew at lightning speed), i ended up with a total of 6 filters. Four sponges and two aquaclear70 hobs. Seems to be the sweet spot for my guy. Lol. But its better to have too many, than not enough.

Redditⓘ good to know

I have an aquaclear70 modified to serve as a refugium for my 20g long. Growing out chaeto pretty well. Also has filter floss, phosguard, and purigen in the bottom compartment below the refugium. Also experimenting with a DIY airstone skimmer, might try posting the results after a few weeks.

Redditⓘ good to know

I turned off the flow for the video haha! I was feeding my clownfish and had just cleaned the glass. I’ve got a koralia425 and an aquaclear70. I think that’s enough flow when they’re both on :)

Redditⓘ good to know

Yes they are gone i didnt know i did a water change regardless because of the dead fish, my filter is strong its for a 70+ gallon tanks i have a 40 gal. AquaClear70.

Redditⓘ good to know

With the HOB filter you can run your filter floss and media and have quicker access to it than you would with a canister but there's not a whole lot of room.

Redditⓘ good to know

I scoop it out of one tank and put it in my other without it and it always disappears. Idk what's going on but it could be that it's a 20g long with a aquaclear70 on it and has too much surface agitation lol

Redditⓘ good to know

In my experience so far a larger breeder tank was cheaper than this setup so I felt I got more bang for my buck, but I tried the smaller route and struggled maintaining my water and cycle. I got my 40g breeder for like $60ish at Petco.

Redditⓘ good to know

It’s a 55 gallon tank, an aquaclear70 power filter (300L/hour I think, but that’s just from memory), and I’ve got 9 neon tetra, 2 Platy, and a Betta in there. It’s a planted tank, although not heavily, as the plants are just starting out.

Redditⓘ good to know

New 38gallon setup. Running an Aquaclear70, Marineland 200W heater. Currently have 5 mollies from the 10g I upgraded from, will be adding an albino bristlenose pleco this evening, and hoping for suggestions on how else to stock it! Thanks

Redditⓘ good to know

replace all media in aquaclear70 with [this](http://www.swisstropicals.com/library/swisstropicals-poret-foam/). its cheaper and way more surface area than any other media. i use it on all my aquariums. depending on a bioload, replace half of the media every week.

Redditⓘ good to know

For a filter I’m using Fluval Aquaclear 70 with just the sponge media in it for the time being, a Fluval 50 power head for flow, and a Marineland 150W heater set to 77F. I used Carib-Sea black live sand for my substrate, and have one medium live rock from my local pet store in the tank as my starters.

Redditⓘ good to know

I know canisters and saltwater don't really mix, but HOBs are fine. Maybe a goby type fish? I know bumblebees are OK, but all I can find is they're brackish only. No real info if they can go marine. I have time to decide on that. Husband thinks I'm insane setting up a big tank for one itty bitty fish.

Redditⓘ good to know

I have never used that bacteria before but have heard good things about it so I assume it’s fine. I use seachem stability or fluval cycle. I’ve used those for my saltwater and freshwater tanks. Imo I would increAse the power of your filtration. When I had my 20G I had an Aquaclear 70. Always over filter.

Redditⓘ good to know

>No sump! Running: Fluval 406, Reef Octopus Classic 90-HOB skimmer, AquaClear 70 power filter (modified for filter floss and media bags - currently not running any media), MP40, & MP10 u/UndecidedMN This is the equipment I have running on my tank. I only dose Microbacter7 and phytoplankton (daily).

Redditⓘ good to know

Filtration is taken care of by an Aquaclear120 HOB and another Aquaclear70 HOB. The lights are just plant growth fluorescents. I've got 4 fancy goldfish, 3 dojo loaches, and a handfull of mystery snails. The plants are just a bunch of random buys from my local petco. There's some anubias, swords, ferns and the lily.