I’m using a Tidal 55 on my sps dominate 20 long. It’s set up peninsula style with the Tidal on one end and a cheap Jaebo SLW-10 wave maker (AI Nero knock off) on the opposite side. Inside the Tidal, from bottom to top, I have the stock blue foam topped with filter floss, then three chunks of live rock rubble. That leaves enough space to drop in a bag on Chemipure blue nano if needed to run carbon, etc... The system is still under a year old but I’m quite happy with the Tidal so far. It provides great surface movement with broad flow control and the surface skimming works well.
Post some pics of that 22 long when you ge it up and running!
-Don