Snail and Coral Death

[PFisher]

I have recently started up a new tank at the office and things have been going well. The tank is about 5 weeks old now and I started adding love stock about a week ago after the nitrite dropped to 0. So far the fish, crabs and shrimp are doing very well. I brought in a couple of mushrooms and a small patch of green star polyps from my home tank and neither has expanded and both appear to be near death.

Snails also appear to have the same trouble. I bought 2 snails and did a several hour acclimation and they never moved. I thought that I may have acclimated them too quickly so a couple of days later (after a 20% water change) I bought 1 more and did a slow drip acclimation over 16 hours. Same result, it never moved.

Salinity, temp, ammonia, nitrite and nitrate all look fine (close to home tank). I have no idea what else to test for that the fish, crabs and shrimp would be immune to. Any suggestions?

Thank you,
Patrick