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Blow it with a turkey baster or a powerhead (that's what I do) and it knocks all the fish poop and other crap. Youll be amazed how much stuff can come out.
yeah the algae is absorbing the po4 that is why your readings are lower than expected. Try to get some GFO in that bish. And find the source of the problem lol (Overfeeding, not blasting rocks, etc).
reefcleaners is an excellent site. They usually give a lot of snails too. Reefcleaners is definitely number one for a clean up crew. Some good crew members would be ceriths, nassarius, turbos, limpets, chitons, and conches.
I dip mine with peroxide and tank water. All my zoas were stressed out but they recovered quickly and in better shape surprisingly. I recommend it because it worked wonders for me.