Overflow Box

[sphelps]

be careful with things like airlines for tube bleeding, while the check valve is a good fail safe the line can sometimes become detached causing failure. You can stick airline up the tube to start the siphon and up it out after. Matching the flow properly will insure air bubbles don't build up, most smaller tanks only need one.

Also run the sump and display tank water level such that the pump runs dry before the display tank overflows in case of failure.