Wow! How many years have you had this tank running?
325 gallon main display
6 x 400 watt mh
remote very deep sand bed
remote dark zone with live rock for sponge growth
some algae harvest in one sump
1900 gph closed loop
large skimmer with ozone
large ca reactor
test alk and ca
feed 1/2 sheet nori and about plum size fresh squid daily
ten percent water changes
suppliment with sodium bicarb and ca chloride occationally if reactor isnt keeping up.