Yea I agree about Derris removal. Tons and tons of Derris comes out of my rocks when I turkey blast it but not enough is going down my hang on back overflow to be picked up in my skimmer in time b4 it sets back into the rocks. I have tons of 1 lbs rocks in my tank so Derris get traps so easily this is why I bought all new rocks so I can change my aquascape to allow a lot of flow around rocks. Ok I do have one of those hang on back aquaclear filters but what should i put in it since I'm already running carbon in my reactor?
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