Tank perameters

[mu8st7ang]

Hey all my first post on MR I usually post on njreefers.

about 4 months ago I upgraded my 54gallon to a 90 gallon with 30 gallon refuge. The tank has been running great except a few acro and birds nest frags I had bleeched out and died. I have alot of monti that is growing good. below are my specs and parameter

90 gallon with 30 gallon sump with refugium
asm g1x skimmer
aquatinics 2 400 watt 14k metal halide with 2 t'5's 1 tru blue 1 actinic

corals inclue
GSP/RTA/ purple monti, yellow monti
about 80lbs live rock
30 lbs live sand
yellow tank
hippo tang
2 percs

parameters
nitrite 0
nitrate 0
ammonia 0
ph 8.7
alk 7.5 tested with salifert new test kit
calcium 620-650 tested with new salfiert test kit

Any advise would help as to why my alk is low and my calcium is high along with ph being 8.7

 

[isgon26]

Are you dosing calcium? I had a similar problem just get a buffer to raise your alkalinity. This will raise your alk and lower your calcium. Also test your magnesium this could be part of the problem also.

 

[mu8st7ang]

I was putting in purple up but then I stopped about a week ago. I add lugos but very minimal. Other than that im not dosing with anything.

 

[MatthewScars]

Start doing daily water changes for week or so (15g a day). The PH and CAL will slowly decrease.

Bleaching and the acro dying is probably a placement issue. Those lights are crazy strong for a standard 90g tank. put the acro at the very bottom and the birdsnest in the middle.

ps: never use purple up or crap like that. Stick with just a 2part additive. the coraline will come.

 

[mu8st7ang]

I have coraline everywhere. My montis are growing like crazy I have them high also I guess they like the light?