What kind of rat is this ???
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The water is not being skimmed, I get what you are saying. here lets see if this pic clears things up a little.If I understand correctly, only the surface water is being circulated. It is skimmed on the left to feed the canister, and then overflowed back into the tank on the right. This is not good. If your intake is on the top of the water, your return should be on the bottom (I would do it the other way around). This way water is completely turned over.

I am moving my planted 55 tank, angels, balas, tetras.what do you plan to stock it with?
this tank appears to have a built int refugium/sump
are you by passing this?