Setting up a 220 gallon tank with two corner overflows. Dimensions are 72" X 24" X 30" . Filtration will be Fluval FX4 canister on each overflow instead of a sump. Stocking of fish will be large community fish and possibly some cichlids of the less aggressive variety. Has anyone used canister filters plumbed through the overflows like this instead of a sump? My thoughts with this is that the input and output of the cannisters can be controlled with the valves that are available on the filter and in this way the flow rates through the overlfows can be controlled. Thoughts?