Ph levels

[lemon drop]

My Ph has been running at 8.6. I know it is out of the ideal range, but is that considered high or low? What do you suggest I do to get it into the proper range? I have tried water changes, I added a protien skimmer, I have two powerheads on an undergravel set up and an EHEIM 2213 canister filter on a 37 gallon tank. I have about 20 lbs live rock, brittlestar, skunk cleaner shrimp, false percula clown and a small yellow tang. :help:

 

[fishguy83]

my pH seemed off, now seems pretty good - RO/DI water helps I think... but maybe someone else can answer how to lower it safely...
but pull the tang out of the 37g... even if it is small - needs more swimming space.