I do not know if this would work with the syphon type pumps but could you hook one up to a spray bar at the top of the livewell? More air is always better for the fish. In my old boat that is what I did for my livewell and never had a problum, but then my pump was probably more powerful than the syphon pumps.

Lotta ins, lotta outs, lotta what have-yous