The hydrozoan problem is a recent development. It is likely they came in with the live rock 2 months ago, but only recently exploded in population since I added the copperband butterfly and started dropping frozen blocks of food in the tank that don't always get eaten entirely (so nutrients on the rise). Before that, I fed pellets only to the clowns, who gobbled up every last bite instantly so the tank was pretty clean.
I had been told that I might be starving the corals, so I dosed stump remover daily for about a month, raising my Nitrates to 2.5-5.0 ppm. It made no difference. But I never tried anything that raised phosphates. The SPS are pale and have thin appearance, all except for the monti which has been doing well for whatever reason, although it's not growing.
None of the frags are maricultured, all have come from other hobbyists tanks, except for 2 from the LFS which I have no idea where they came from, I guess originally maricultured. Which, now that I think of it, are the only 2 that have survived this long.
Flow is an mp40 on reef crest. Used to be 2 mp10's. Should be enough for a 57 g, seems like a whole lot of flow in there.