I have one SQWD in a 6 foot long tank. It doesn't do real well for that size tank, I really need 2 of them. Lots of blast near the nozzel, not much real flow develops. I'm pushing about 1250 to 1300 gallons thru it. Still will use my Red Sea wave maker since the SQWD didn't do the trick over the 6 foot distance. I may add another SQWD eventually with a slightly smaller pump, like a mag 9.5 in hopes that it will stay on a little longer per side. Blane Perun at Farms@TheSea was selling them for $35.00, so in the match or beat deal Aquatic Warehouse offers, you might be able to get one from them at that price as well.