if youre looking for the back and forth movement the tunze wavebox is the way to go with vortechs to supplement for flow. I've got two in my 75g in reef crest mode on anti-sync and have to say that they are just incredible powerheads.

i got in on a group order almost a year ago and i bought each vortech for 350 shipped brand new

the most recent one had them for 375 shipped brand new