thx canuck...honestly with all your other water parameters being in check, i think u added to much live rock at one point and the flux ur fish just couldnt handle it with ur ph going up an dwn so much in the bpast weeks...thats a major thing...ph shouldnt b adjusted at all within a week or 2 weeks even, most of the time when ppl have no explanantion for deaths its becuz of ph....ph is like the masked murder more dangerous then temp,ich,salinity,hd,or anything else u could think of
ph is the single most important thing besides oxygen ina tank