I have two wp-25's in my new 75g. One powerhead is enough to make some nice waves in this tank, so I'll probably set the other to normal flow. I bought both off eBay (along with a DC6000 which I'm also impressed with). My plan was to use these until I save up for the Vortech's, but I'm starting to question that idea because I really like these wp-25's, and you can't beat the price. In fact I'll probably order a couple more as backups.