My clownfish spend half their day in the slipstreams. Hah. Very entertaining.
What I like most is when one spaces out and the stream throws them across the tank and they catch themselves inches away from the glass and I get scared they'll get hurt, then the little buggers go right back to where they were and repeat, lol.
I remember my algae blenny accidentaly swam into one of the streams once, and welp, that's the last time he went near a powerhead, lol. Now he stays to the rocks and glass.