ive noticed alot of copes (i believe thats what they are) and other lil critters in the overflow section of my 72 bowfront SW tank. i was wondering is there anything i can put in there that will eat them that would be able to stay in such small quarters....like invert or fish, i was thiking of putting a few piece of LR in there and maybe a fish or crab or something ....just a question, i just want everyones opinion before i really consider doing it...thanks 