[michika]

Since upgrading to a larger tank in the beginning of September I have lost a total of 8 colonies and medium sized frags. I've also probably lost at least 7 small frags since upgrading.

Parameters have always been and continue to be
Temp 78
SG 1.025-1.026
Alk 8dkH
Ca 440ppm
Nitrate 0ppm
Nitrite 0ppm
Ammonia 0ppm
Phosphates 0.5 mg/L

We run 1x 400w 20k MH for approx 6-9 hours a day, supplimented with actinics, and 10k T5s. Tank is 77g with 75g sump/refugium. 70lbs live rock in the display tank, 5lbs in the refugium.

livestock; Lemonpeel angel, 2 blue chromis, 2 yellow chromis, lunar wrasse, regal tang, 2 tomato clowns, 1 ocellaris, signapore angel, sleeper goby, sixline wrassee, psychadelic mandarin, 1 red fromia star, 1 sand sifter, and a cleaning crew of snails, and hermits.

Corals: Frogspawn, elkhorn, zoos, cactus coral, 2 sun corals black and orange, 1 crocea clam, 1 dersa clam, neon green candy cane, and an assortment of SPS. Only my acropora seem to ever be affected. Usually whats happening is they RTN whenever I seem not to be home.

This morning something ate my clam from the bottom up, cut him free from his rock at the top of his tank, tossed him to the sandbed and ate him from the bottom up.

I am at my wits end on what to do. Everything seems fine except for my corals. Fish are all eating like piglets, water has been testing normal. I've been doing water changes bi-weekly about 10g every time. I top off with RO/DI water too. I'm also running carbon constantly, but it doesn't appear anything is making a difference.

I'm hoping to add more rock in the near future, and we'll be setting up a second 400w MH bulb this evening to complete our lighting set up. I can't even think what might be doing this, or why its happening. Please help!