My water perms are all good.... 8.3 PH, 1.23-1.24 Sal, 20 or less ppm nitrates....... nil on the ammonia and nitratites......... and I keep losing inverts..... all shrimps and crabs..... I've lost several hermits over the past month or so.... although most of them seem to be out of their shells and eaten..... but the shrimp and the emerald crab I found tonight have no visible damage whatsoever.... and they've all been in the tank for decent periods of time..... so I don't think it's acclimation....... any ideas???????????