Algae - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 5 Old 06-25-2010, 08:33 PM Thread Starter
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I have a 72 gallon fish tank. For a few months, I've been getting these little black (sometimes green) dots on the inside of my tank's glass. My pleco doesn't eat it. These dots was on one of my decorations so I took it to the petstore who said it was black hair algae. I did a search but the picture of a black hair algae looks like hair. These are little dots. I take my scraper and scrape it off. Is it possible that if I leave it alone, it will look like a hair?

Does anyone know what these little dots could be?

Thank you

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post #2 of 5 Old 06-26-2010, 02:06 AM
Sounds like it could be hair algae due to the dark color... but pictures would help for anyone to see it best. If you can please take a few and post them up here.

Also, I always check this site to get an idea of what i'm dealing with algae-wise:
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post #3 of 5 Old 06-26-2010, 11:55 AM
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Your description sounds exactly like green dot algae. The green is very dark, black even; if they remain as dots (although the dot will enlarge a bit) that's what it is. Black brush algae is quite different, it appears as tuffs of very dark green almost black, though technically it is a red algae.

The dot algae is common, though some tanks don't seem to get it. Nothing I know of eats it. A good aquarium scraper is needed to remove it. If left it can be hard to remove, sometimes requiring a razor blade, but be careful not to scratch the glass (and never use a razor blade with acrylic tanks). I find that if I run a stiff sponge scraper over the front (and maybe side) glass every week during the partial water change, it helps to keep dot algae from forming, but in my 115g (which is the only tank where I ever see it) some will get missed now and then.


Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #4 of 5 Old 06-26-2010, 02:01 PM
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i use an old store card to remove this.

when you set up a new tank,hide an extra
sponge or two behind some decor,that way you have
something seeded for you next filter.
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post #5 of 5 Old 06-26-2010, 04:54 PM
i left mine to grow and see how long it would get.the weird thing is the water is very clear if they grow to that stage if not it's murky green .... a sponge will scrappers needed.

5x2x2 aro,highfin bat,fei feng,ST,albino tinfoil,c.perch
4x1.5x1.5 planted tetras,harlequins,
otto,WMM,2 types of celebes rainbows,rcs,amano, bamboo,red ramhorns,MTS
3.5x2.5x2 flowerhorn,pleco
3x1.5x1.5 russel's lion,blue cleaner,sixline and leopard wrasse,maroon clown pair,green chromis,scorpion,tiger cowrie,turbo,lyretail anthias,jewel,anemone,star polyp,marbled and giant green mushi,zoa
2x1x1 nano sw shrimps
22 May 2012
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