Advice: Unhappy tank..

[ghztew]

Background: 90g tanks, 130lb LR, 150lb live sand, Remora Pro, 33g sump,

I have 2 pink skunks in my tank, a small bubble tip and a Yellow Colt.

Problem: My yellow colt has been white for the past 3 weeks, it goes through it's normal opening up during the day and it closes at night.. lately it looks a little more droopy than usual. It began fragging when I bought it and I think it may have completely fragged now.

Nearly all of my tests that I have checked look good. My amonia, nitrate, nitrite and calcium are all in check (0,0,0, 400). Specific gravity fluctuates between .024~.025 (depending on my water changes etc..

I just checked last night and my pH is off the charts, much higher than the 8.3 is right now.. i think my readings go to 8.6 so I'm guessing my pH might be closer to 8.9 or 9.0 right now.

THe big question I have is whether the pH is the cause for my yellow colt turning white.. and what's the best way to lower my pH down to the 8.3 range.. at this point my plan is to get some baking soda and slowly lower my pH over the next week.

Any suggestions on how to get my yellow colt back to it's proper condition & pH levels back on track will be greatly appreciated.