Alright mate . How deep is the netpot in the res ? ,touch the rockwool cube & if it feels wet then maybe drop the water level a bit or dry maybe raise it... should feel slightly damp,its a fine line like .Can you put up some pics of your res bubbling chop , bucket lid removed ect ? You may not have enough air going in & that will slow her a lot. Pics & specs of pump maybe ?.:smokebuds: