idk about boaphiles cause I've never used em, but generally in the racks I build there is a nice 1/16"-1/8" space at the top of the tubs that can provide enough air flow as long as the air is moving around your tubs..aka if you run a ceiling fan or something to keep air moving, but I put holes in my tubs anyways.
I'd set your flexwatt so that your hotspot *inside the tub* reads no more than 95*..and I think 95* is almost pushing the limit..I keep mine closer to 91*
For water bowl placement, go with whatever works best to get the right conditions. Front, middle, back, I dont think it really matters.![]()