"Debris" at the top of the tank

nzafi

Goliath Tigerfish
MFK Member
Mar 14, 2008
2,177
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USA
I don't know why but in the last couple weeks suddenly my tank has a ton of debris or gunk floating around the top of the tank. This occurred right after I did a deep clean of my FX5. Initially I removed by the blue filter but since then I have put another back in for almost a week now. This happened a while ago and went away and not sure why it has come back.

My setup is a 75 gal tank. 1 9-10in rhom. It is a 75 gal tank with a FX5. I have the input on one side of the tank with the output in the middle of the tank. On the other side of the tank (opposite end of intake) I have a korlia 1400 that is slightly angled up to ensure surface agitation. Also I have background on the sides and back of the tank which limits light and prevents algae.

Thoughts?
 
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