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Discussion Starter · #1 ·
It's a 4 years old 10 gal RCS tank. About 2 months ago I've noticed this brown/black stuff growing on the back glass of the tank. Have to admit that for the last few months I didn't keep up with water changes too well. Now I change the water as I did in the begging, about 20% every 2 weeks. I have about 100 RCS and feed them every other day.
What kind of algae is this and how to get rid of it?
Thanks.
 

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I cannot clearly see due to all the reflections. Is it like a slime ? how easy is it to remove (just drag the finger, rub with sponge, get that razor out). Is it like a mat or does it grow in small tuffs ?

From what little I can see I would go with BGA - cyanobacteria. It can grow in floating mats and near the waters age. It also grows on the substrate. Looks similar to what you have ?
 

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Discussion Starter · #3 ·
The green stuff could be BGA but what is the black one? I try to scrape it off with a credit card and it's not like it's falling apart on it's own, you have to put some effort. But ones it gets off it's kind of sticky/spongy thing. It easily falls apart ones it's not attached to anything anymore. It sticks to the plants, glass, gravel.
 

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Hmm, try to spot dose a little excel on a part covered with the black one with the filter off. Does it turn pink or white ?

I have seen this very fine type of BBA? in low tech tanks that may fit your description /algae. It is like a velvet mat.
 

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Discussion Starter · #5 ·
I don't have excel unfortunately. Forgot to mention that the algae was about 3mm long when I scraped it off. When I first saw it I though well, it is time to replace the bulb. I replaced it with a new one and it still grows.
 

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Yes, sounds like the type of bba I have in mind. Do you have some hydrogen peroxide? You can also use it to treat.

From the looks of it, the infestation is severe enough to require a whole tank treatment. It needs to be physically removed when possible and active treatments. Once it grows it is very hard to get rid of just by modified tank parameters.

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Discussion Starter · #7 ·
So I guess I have to inject H2O2 locally, right? What do you mean by whole tank treatment? I will have to remove all the shrimp, plants, etc? And if I do it locally will it change the water parameters in the way that it's gonna kill my shrimp?
 

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Before zapping it remove it manually. Drop the water level below it and scrape the glass with a new razor blade if the credit card didn't work well. I'd put a paper towel down to catch if your hand drops any.

Zapping is better used when the plants are involved. It's easy to get any kind of algae off tank walls.

I had a monster CB/GDA and maybe GSA mat on my tank a year ago due to neglect/stagnant water in that spot then too much light, wiped it off and it didn't return. I looked at the nasty thing for about a month to see if it would die but it just got uglier so I took a number of paper towels and wiped it off when the water level was low. I managed to avoid dropping any of it into the water somehow. There was some GSA under it that I rubbed off with my usual Mr. Clean sponge as the tank is acrylic, no razor blades allowed. I hope that once the mat is gone and you have cleaned up the tank it won't return.
 
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