[stevem]

sound to me like u need to find a new store.
first live sand nor live rock cause ich
u can not treat with copper in tanks with either.
second r u buying all the fish from the same store, maybe u r getting sick fish to start with.
third your choice of fish is a problem
snow flake should not be in a reef as they will nock rocks down constantly.
emperer angels, bicolor angels and most butterflies are near impossable to keep, but yet stores keep selling them.
yellow tangs, cardnials,sailfins easy to keep
Mandarins not so easy as they need a large amount of live food, before long they eat all live food in the tank and starve to death.
hippo once they are established they r pretty hardy.
your water chemistry seems fine
how many fish do u have total and how long is your tank up ?
french angel is also not reef safe
u need to do a little research before u buy your fish, and add 1 at a time with atleast 2 weeks between