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Tunze Comline DOC Skimmer 9004

Tunze Comline DOC Skimmer 9004

Scored on 6 verified owner verdicts, from 22 comments read across 1 community
TL;DR
Owner feedback on the Tunze Comline DOC Skimmer 9004 is limited but consistently positive: most who weigh in call it reliable and easy to dial in, praising the DC pump's simple adjustments, decent cup size, and lack of microbubble problems, with one owner noting it pulls a lot of gunk out of a 40-gallon tank. A couple of owners running it on smaller 20-22 gallon nano tanks found it worked fine, though one felt it ultimately wasn't strictly needed at that size. No recurring complaints emerged from the available reviews, though the sample is small enough that firm conclusions about downsides can't be drawn.

83% of 6 verified owners recommend the Tunze Comline DOC Skimmer 9004, based on real owner verdicts aggregated from Reddit, enthusiast forums, and YouTube.

What 6 owners say
22 comments reviewed · scored on the 6 clearest verdicts
83%
Recommend
5 owners
17%
Neutral
1 owners
0%
Don't recommend
0 owners
Source
Score
N
Counted in the score
Reddit
83%
6
Reviewed, but not counted — and why
No clear verdictiSetup, tips & quirks
9

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. is shown for perspective but kept out here — hover the i for why.

What owners like
  • Owners describe it as reliable and effective, several saying they're very happy with its performance and even that they 'absolutely love' it · 6 · 100%
  • Works well even in smaller nano setups (20-22 gallon tanks), with the DC pump making it easy to dial in flow and cup adjustments while keeping microbubbles to a minimum · 3 · 50%
What owners flag
    Who it's for
    A great fit if
    • Nano/AIO reef tank owners (20-40g) needing an in-chamber skimmer that fits tight spaces
    • Reefers who want a DC pump that's simple to dial in and adjust
    • Owners running heavier bioloads (40g+) who need real gunk/DOC export
    • Hobbyists comfortable with a short break-in period and occasional teardown/vinegar cleaning
    Look elsewhere if
    • Very light nano loads where owners found the skimmer wasn't actually needed
    • Anyone expecting silent operation right out of the box during break-in
    • Owners unwilling to periodically disassemble and clean the pinwheel/magnets for performance

    Synthesized from what Tunze Comline DOC Skimmer 9004 owners say — not a spec sheet.

    Top quotes, sourced

    22 reviewed · 6 shown
    Sentiment
    Sort
    Reddit▲ recommend

    I have a 9004 in the rear chamber on my 36 gallon and I've been very happy with it so far.

    Reddit— neutral

    Worked well enough, but ultimately found it wasn't needed on my 20g nano.

    Reddit▲ recommend

    Use the Comline DOC Skimmer 9004 by Tunze in my smaller build and works quite well.

    Reddit▲ recommend

    I do have a tunze comline doc 9004 in my 40 and it does export a lot of gunk.

    Reddit▲ recommend

    still breaking it in, on day two. So far so good.

    Reddit▲ recommend

    I absolutely love my comline skimmer.

    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

    For a skimmer, we use a Tunze 9004 Comline Doc Skimmer in our 40 gallon breeder (which was a recommendation right from the BRStv 5 minute guide on Youtube that someone else mentioned).

    Redditⓘ good to know

    I bought a jbj nano uv in-line that is connected to my return pump, very slim and doesn’t take up to much room.

    Redditⓘ good to know

    IM40g nuvo Tunze9004 skimmer Titanium BRS heater Chemipure blue A shit ton of seachem matrix Filterfloss

    Redditⓘ good to know

    I tried but failed with xenia, montipora, Duncan, sugar canes, zoas. I really would love to have a zoa garden. Today added the internal Tunze Comline DOC Skimmer 9004 DC. Was worried about the wave maker locations and the flow. I'm not bothered with the bubbles from the filter, as that doesn't happen often.

    Redditⓘ good to know

    Oh this worked! I even wrapped the bottom in filter floss. It's a bit weird still because the bubbles are still diffusing out, but slowly and not spread out. Thanks for the advice

    Redditⓘ good to know

    Sometimes my outside magnets get ever so slightly dislodged from the rubber around the edge and it’ll do that, try pushing the magnet down more and spinning it against the glass and see if it catches better.

    Redditⓘ good to know

    I’ve watched the video now and did as they said, how often will I need to be emptying the cup, it’s 0,2 liters

    Redditⓘ good to know

    Have you deconstructed it and bathed it all in vinegar? Mine was starting to produce less n less bubbles. I took it apart, soaked it in vinegar, scrubbed everything with a toothbrush, reconstructed it n its now good as new. Mine actually had some hair wrapped round the pinwheel.