So the fish room is almost done and I am looking at plumbing in a line that will do 20 or so tanks (40 gallon breeders). I have heard mixed reviews about linear piston v.s. diaphram and am not sure what to get. Here is what I am looking for..... A pump to run around 20 or so tanks (sponge filters) Must be fairly quiet Economical to run A good price I was going to get a jehmco but then I had a few people suggest a HiBlow or a Pondmaster. Does anyone have first hand experience with these pumps and if so please give me your thoughts on them. Any help is greatly appreciated.