well, ive had my 125 sps tank up and running for a long while now. it has been thriving and everythings been growing like crazy. for some reason, the past 3 weeks for some reason, i cant keep any new fish or inverts alive for the life of me. to start off, here are my params
ca-400
alk-12dkh
ph-8.3
temp-80.0
salinity-1.025(on a refractometer)
nitrate-0*
nitrite-0*
ammonia-0*
*on aq.pharm test kit
now that i think of it, this problem may have existed a few months before. i had a nice community of inverts in my tank consisting of 100 hermits, 3 turbos, and several astreas. i noticed my hermits slowly dwindled down to about 5 over a months time until i did an interceptor treatment which took care of them. i did only one treatment but i still did the 2 large water changes and carbon. so at that point i had my turbos and the astreas left, around this time, the algae started popping up. then my turbos seemed to dissapear. now were at three weeks before now. then i added 100 hermits, all of which dissapeared within 3 days(no i dont have a mantis) then i added three turbos. the first day they were doing fine, second, they were acting very slow, third day they were still alive but pulled back some in their shell and all three died by day 5. then i added a kole tang which did fine for a few days. he acted kinda skittish and hid but he was looking ok, then he dissapeared. keep in mind this whole time im adding frags of sps and theyre doing perfectly fine....
so thats where i am now. on a couple occasions i did a couple 50g water changes(my total system volume is 175 gal.) and i didnt notice any change
any ideas