i cant believe im the only one on here to think of this, i dont plan to do it BUT i do got the plans in my head if you want to, anyway i wanted to make pvc pipe(pretty big, big enough for all your fish to swim comfortably threw)make the pvc pipe connect two(or more) tanks together
kinda like the pic(1st pic) in this thread but instead of it coming back to this tank it goes to another tank...http
/fish.orbust.net/forums/index.php?showtopic=31174
in most cases itd go out the top of the tank, that is unless you want to cut holes in your tanks(yeah right)
also you guys know you can make a take out of a rubbermaid container? it works just like a tank except you cant see threw plastic(great for feeder fish, or whatnot)