Cyano???

[Murminator]

Originally Posted by G1GY

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Sounds to me like you might be seeing coraline growth. Is it just on the rocks and powerheads? Does start out like a little spot and then keeps getting larger? If your not finding it on the sandbed, good chance it's not cyano IMO. Also Cyano can just be rubbed off without using your thumb nail. As a matter of fact, when I had a bloom I was siphoning it off of stuff.

I have coraline that is very dark as you described.

I might be a little early in saying this, but CONGRATS!

Yes it starts out small and grows larger...and no there is none on my sand bed thanks to goldenhead sleeper goby. As far as this there is no way of siphoning it off it has a good hold.