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Old 03/03/2018, 06:13 PM   #1
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Stiff dark brown algae covering all rocks

Hi ,

I have these dark brown stiff algae all over my tank . Now all my acros are thriving but these dark brown stiff sometimes look horrible .
PO4-0.05 and nitrates - 10-20 .

What kind are these algae ? Some form of GHA ? Red turf algae like Callithamnion?
I have a few snails - trochus and turbo . What will eat these buggers ?

Will tuxedo urchins help ?


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Old 03/03/2018, 07:40 PM   #2
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Its some type of red turf algae alright.
Urchins should clean it up I'd expect, & perhaps some grazing fish, but some of these turf algae are unedible to fish.

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Old 03/04/2018, 08:40 AM   #3
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I have been fighting something similar for a few months. It looks a little different but not much. Mine tends to grow in certain areas of the top rocks and even get on the corals. It does not come off easy we have taken to removing the worst rocks and brushing them with a metal brush. Going forward we are going to blow off the crevices in the suspect rocks on a daily basis to get rid of any excess food or detritus. Also have reduced the lighting times and will feed less. Nasty stuff.


100 gallon DT and 50 gallon sump with refugium.
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Old 03/05/2018, 04:58 AM   #4
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If rock can be taken out of tank, use H202 and apply with a tooth brush. Let set 5 minutes and brush off and wash before returning to tank.

Hydrogen peroxide is collateral damage to everything when used as a concentrate with a tooth brush. I also use it as a 10 minute dip. Mix a 10% solution of H202 with tank water. In some cases I have had to dip twice.

Both techniques work, however, coral can be damaged if applied incorrectly.

Laissez les bons temps rouler,
Patrick Castille

Current Tank Info: 10,000G. Greenhouse Macro Growout
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Old 03/12/2018, 02:45 PM   #5
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i had that all over my tank to the point all the rock in the tank looks maroonish. then i added a powder brown, convict and clown clean them up in couple of weeks. the tangs didnt eliminated them from the system, they will keep them in check.

Dont let me know where u lived if u have a nice pair of clownfish in ur tank!^_^
Clown kidnaper^_^

Current Tank Info: 300DD, SM200/RD3,ATI 60-8X80+4X75, 2 Sea Sweep & 4X6105 & 6208
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