Have a 75g DT with 25g sump. System is 1.5 yrs old. Had 2 clowns, 2 banggai cardinals, diamond gobi, foxface, skunk shrimp, 15ish small crabs and snails CUC. Also have started corals; 8 softie frags. Three days ago found the clowns kind of hiding and no other fish around. Finally yesterday found what's left of the foxface being enjoyed by a crab. Water parameters: temp 88, sal 33.6, amo 0, nitri 0, nitra 2, Ph 8.3, Alk 9.0 from yesterdays testing. These are essentially identical to what I have been running. Only thing I have done differently in the last week is a thorough algae cleaning of the back wall and gyre 5 days ago. I have done this before and while the water gets murky for a few hours the filtering (sock, skimmer) have it back to clear in 8hrs. The clowns, shrimp, CUC, AND corals all seem fine. Feel like I let them down...Any ideas?