Well im finally constructing my fuge below my 29 gallon. I want to seperate the drain, fuge and return with plexiglass pieces from lowes. Is there any material not safe for a reef? Also, the plan is to have the first piece from the bottom to about 2/3 to the top, then another in the opposite direction about half an inch away. Is this acceptable or do i need to have three 'slots'? Maybe someone has a direction site reference or something before i just wing it? Thanks, John.