Cobalt vivarium - soon to start :)

[deranged chipmunk]

Are you using a ball valve to control your flow/ pressure?

I shouldn't need to. Both filters have adjustable flow. The fluval has a valve that controls both intake and output, the eheim has separate valves. K may add another valve in for extra security and to keep the siphon alive on the fluval. They are a pain when there is a low water level.