Is it possible to just use a standard style hang on overflow box to get the extra water drainin on a non drilled tank? or do u guys think that has more room for failure if the siphon is lost? Just thinking it'd be advantageous to skim anything off the surface and dump that out. I'm a bit more clear headed today lol, def. was in panic mode lastnight. I'm gonna start by picking up some pvc this weekend and making a "whole house" drain around the perimiter of the basement so i can tie in everything on one line straight to the sump pump, im thinking 2.5"-4" should handle 8-12tanks (125-650). Luckily i left around 4-6" behind all my tanks around the perimiter so i should have just enough room to squeeze the pipe in. I dont want more than one pipe running across the middle of the floor as the basin is located just about dead center of the room under the stairs but we'll see how that goes as every tank is basically jammed right next to one another around the outside walls. I'm only 5,8'' so i left myself very little room to get underneath/in between most of the stands to work on things. Hopefully i can get away with one long "L" shaped drain pipe behind them but at this point im not opposed to having it in front of the tanks just to make things easier if/when something goes wrong. The first tank (300) should be easy as theres already an extra bulkhead in the sump with a ball valve i put in for cleaning the box and they should progressively get harder to hook up from there lol... A bit overwhelming right now, but i cant wait to just sit back and enjoy everything again when that day finally comes.