Join Date: Feb 2012
Location: San Antonio, TX
depending on how long its been there it could be a sign of a few things like too much fertilizer/light but in your case Im positive its probably been there a while the fact that its green rather then green/brown tells me your tank is cycled and established. Wish I could see the rest of it.
P.S. Free up that filter looks like the flow is realy low, I use the same kind turn it off clean the tube and the foam insert in the cartridge chances are if your filter has that much algea your foam element is worse. If after plugging it back in it wont start again gently bump the impeller with a pen.
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