So, I had gone back and forth between using elite and using blue with phosguard. My corals seem to hate phosguard so I stopped using blue with phosguard, and stayed with elite. Elite seemed to work fine. Corals were happy and coralline was spreading. Had a cyano problem but not out of control. When I was ready to buy fish, I read forums where people say chemi pure elite causes hlle. So now I'm back on blue with phosguard (the same jar I bought a year ago). Coralline has receded drastically. Corals don't look bad, but definitely don't look their best. Would it be safe for my wrasses if I switch back to elite? Or should I stay with blue but use gfo, specifically aquavitro phosfiltrum, instead of phosguard?