Anybody have any suggestions for a relatively cheap sump for a 300 gallon display tank? Was thinking a 75 gallon long 72"x18"x13". That is what is recommended by glasscages where I got the tank and stand. I don't care what it looks like inside the stand so I didn't think it was Necessary to spend big money when a Rubbermaid will get the job done. Has anybody done anything creative?