Originally Posted by Mystery
Why wouldn't it work?
two tanks next to eachother at the same level with a PVC
pipe in the middle would only create still water in the pipe. there would be no circulation in the tanks at all, and would pretty mich defeat the purpose.
there is an alternative sump method that could be used, where the tanks are side by side, but one is lifted higher than the other. the water is pushed from the lower display to the higher one via powerhead or internal pump, and the highertank would overflow back into the lower display.
but its better to go with the over under design. it takes up quite a bit less space, andIME is easier to work with.