I just picked up a 55 gal. and I'm going to stock it in a couple of months (once the cycle is over). I've had my eye on corys for awhile. Does anyone have info on these guys? I believe they stay small, 4" - 5", correct? Do I need to provide lots of hiding spots for them? I've heard they help to clean the substrate, is this true? If they root through the substrate, can I still use Flourite in the substrate for my plants or will that injure them? What temps do they prefer? pH? I plan to keep my tank around pH = 7 and 80 deg. F. Lots of plants (will take quite a while for them to fill out in the tank, I suppose...), driftwood, perhaps a couple of caves in there as well.