I'm kind of new to this, but I bought 2 Wav's for my 215, I have an Apex Fusion, I really like them. I prefer no wires on the outside and these are on each side of my tank, I would hate wires hanging down. Visually the wire inside disappears into the black background, the way they look and the fact that they work with my Apex, sold me on them. I was reading a thread just yesterday about both of these powerheads, people were saying the Wav's were quieter, I don't think they're super quiet, sometimes I think there's a truck running outside and realize it's my tank...lol They not insanely loud but they're def. not silent! I like how adjustable they are too, I can' put them anywhere in the tank and point them in any direction, I won't put them at the back because I don't want to risk scratching the paint off the back.
I'm still learning how to program them and have no idea how much flow I actually need...so if anyone has any insight into that..please let me know, I have a fish only tank. (I don't want to hijack this thread though).