the wpg doesnt exactly work, ive read that anemones do better in tanks of 30gals +, because in smaller tanks like 22gals the parimeters can fluctuate easier making the anemone stressed and unhealthy, in my opinion i would rather not use an anemone, use another coral that can do well in smaller tanks, look at it this way "you dont want to go out and kill an anemone, youd rather it be healthy and living even if it nots in your tank" plus clowns use many things as hosts like the sponge on powerheads, gsp, Xenia, and many others