Skimmer Impeller Mod

[Hightower]

To all those that have done or know about the ASM G2 recirc mod:

After I have the sedra pump setup as a recirc, the feed water will have to come from either the tank outflow to sump pipe or another feed pump.

What are the pros and cons to both other than the obvious extra pump heat and noise/power.

Also If I were to split off my tank outflow say with a T and a ball valve, is there such a thing as too much water feeding the skimmer so that it is overwhelmed?
If so how much is too much.

Background - 90 gallon tank 30 gallon sump, main recirc pump is a Custom Sea Life T4. Probably in the area of 900g/hr running through.