12-21-2009, 11:27 PM
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Is it kinda like slimy looking on the gravel, like a layer over the pebbles?
The Blue-green algae is often caused by very low nitrates, so check your water parameters and come back to us . It is fairly common to have it growing in the substrate against the front glass from where it can spread cause it gets more light there from up top and from the outside (room light). Can also be linked to new setups due to ammonia peaks. Uncleaned (not vacuumed) substrates and dirty/ clogged filters may support its growth. Poor water circulation is another possible cause so check your outlets.
I recently battled it (along with 4 other types algae) in the 55g, I had extremly great sucess in blacking the tank out completely for 4 days, completely cover it with dark towels or anything thick that does not allow any light. Ni fish feeding (yes they will be fine unless you have baby's in the tank) and then do a 30-40% w/c with some goof vacuuming.
Hasn't returned since then and that's been like 4 weeks since it first grew.
And no algae will not kill you fish - But algae is often supported by poor water quality and poor water quality can kill your fish