ok ive been watching my tank for awhile now and i switched to mulch for about 2-3 weeks. and ive started to see some piles of tanish powder. at first i couldnt figure out where it was comming from but now i know. there are little black bugs (that have wings) in there. they are eating at the fake wood. i looked at the wood and there are about 30-40 little bitty holes in there. i guess this bug eats at the wood. i was wondering what is the best way to get ride of them. i was thinking of just buying some bed-a-beast substarte and getting ride of the mulch. do you think i should get new fake wood or try and soak the old ones to kill the bugs.. there just really annoying when you see a pile of fine grain wood in there and see them crawling around.