So my 100 gallon needs more life in the middle. My bichirs hang out at the bottom (obviously) so during the day my tank looks kinda empty. Current stock is 2 sen, 1 del, 1 leopard bush fish, a big rainbow shark and some mollies that haven't been eaten yet. Will be adding a moke from
Rocksor
soon. Any dither suggestions that won't end up as an expensive snack?