well i noticed something interesting right now. lights on fish swim about happy, excited to see me thinking im gonna feed them. lights off my tank turns into fight club. neons doing the usual sparing for dominance but what was more interesting was the rummy nosed tetra i have in there. i have 2 and they are smaller than the harlequins but one is stocking them while lights off and seem only to be interested in the bottom fin. i think i found the real culprits. removing them as you read this.