im going to build my own sump/filter/refrugium under my 30 gallon tank. the support will be from the tank stand itself since the sump will fit in perfectly on all walls. i need help because i dont know waht kind of silicone is safe to use on a tank. waht have you used taht is safe, works, and cheap? also i need to know if i can buy thick clear plastic to use instead of plexiglass? thx in advnce
