OK so here's the deal. In the last two months I've had the following fish in my tank:
sleeper goby, 2 firefish, royal gramma, ocellaris clown
The only one that is still present is the ocellaris clown. I've searched high and low, as much as I could without ripping the tank apart, and absolutely cannot find any bodies. I know that one of the firefish was consumed by an open brain (That I've since gotten rid of)...but I can't for the life of me figure out what the heck happened to the other fish! I don't believe it was acclimation related - they all went through a nice gentle acclimation and seemed to have been fine for a couple of days (gramma disappeared after about 4 days, goby after about 3 weeks, firefish after 2 months...the one that wasn't consumed by the brain, obviously)
Water params: Sal 1.024, PH 8.4, Alk
(dont recall exactly, but it was safe), calc 520ish, trites 0, trates under 5 ppm
, phates, under 1ppm. Is there something else I Should be testing for? The only thing I can put together is that all of the fish that have disappeared tend to be "hiders" - they found a spot in the back left corner of the tank where they liked to chill...whereas the clown, as clowns tend to do, is constantly out, swimming, and doing his thing all over the tank.
Anybody have any thoughts? Only other stuff in the tank: around a dozen nessarius snails, a handful of turbos, 9 red legged hermits. I've caught site of a couple large bristleworms, but they've never shown any tendency to go after anything swimming that I've seen...
As far as corals, I have GSP, caulastrea, zoanthids and palythoas - all of them are doing fine, so I suspect my water quality is not the culprit. Is it possible that I have some kind of hitchhiker I've not seen until now (tank has been running for around 3 years, with a break and rebuild about 4 months ago) that would be actively taking out my fish? They were eating okay while still visible, but sometime overnight they just seem to be going *poof*!
Any suggestions greatly appreciated - as much as I love the corals, my wife is getting frustrated by the lack of "Swimmy" life in the tank.