You need to invest in a good test kit, it is hard to diagnose problems without knowing all your parameters. Take a water sample in to one of the better SW stores and they will check parameters for you for now.
Until you know whats happening keep doing large water changes as often as possible to try and keep toxins from building up and if you are not doing it already get some carbon in running in your tank as well.
Thats all I can offer for now but I am sure some of the gurus on here can be of more assistance
Good Luck
Ian
__________________
Biocube 29 est 05/05/08, Koralia 1, 30lbs live rock, ,yellow tail blue damsel, pair cinnamon clowns, baby snowflake eel,Toadstool , metallic green mushroom, assorted zoos , kenya treen
180gall display, 190 pds live rock, virgate rabbitfish,bluejaw trigger, bubblletip anemone,yellow tang, sailfin tang,melanarus wrasse, cloud wrasse,
|