Powdery black stuff in my tank. What should i do? - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 3 Old 04-16-2009, 03:33 AM Thread Starter
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Powdery black stuff in my tank. What should i do?

Hi all,
I am new to this forum, and have come to enjoy it. I have a problem and dont know what to do? I have a 300litre tank with tetra's and Gourami's and plecos etc. Total of 38 fish. I use gravel as a substrate. I have a E-Heim Aquaball Internal Filter 650l/h and a 900l/h gutter filter which i recently converted to an External BioFilter ie. using bio-rings, charcoal and aquarium wool. This problem which i experience started prior to me converting the filter though. I notice some fine black powdery deposits on the internal filter as well lots of it on the plants and on the edges of the leaves. I conducted 3 water changes (10-20%) in the past 3 weeks, but that doesnt seem to help. What is it and what should i do? Concerned...
PS. I have attached a photo of my work in progress tank. I am treating the driftwood which i intend to put in this weekend as well as add more plants.
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post #2 of 3 Old 04-17-2009, 10:13 AM
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Hi samlin, and welcome to the forum.

Can you post a clear photo of the "black stuff" on one of the plant leaves so we can see it?


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 #3 of 3 Old 04-17-2009, 02:17 PM
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Maybe the filter is too powerful and powdered the charcoal. Ive had this happen about 3 years ago. Its not bad unless you leave it there for about a week or so. Just change all the water as soon as you can. Dont forget to take out the filter with charcoal. You could get a weaker filter or just buy a small regular one. I dont seem to be having any problems with those.
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