Looking to put two air pumps on my 125g sponge filters. Right now I have two Optima's, one on each sponge. Looking for something to push more air to increase water flow through my sponges. On my 90g I have two Rena 400's which appear to be fine for that tank. I'm readind the specs on a Schego M2K3 and a Luft air pump. Schego claims to move up to 300 liters an hour. The Luft claims to put out 7psi against water pressure. Which one do you think is better, the Luft or the Schego? Or should I get two more Rena 400's for my 125g, or another brand that will move alot of water.
