Ebson Salt, reef salt, baking soda
1 teaspoon for every 5 gallons of each.
I use this trusty mixture for my calvus tank since they need a ph of at least 8.2 Its much cheaper then purchasing the actual chemical intended for it and you can use your reef salt since you already have a reef tank!
And YES it does raise my ph so you have to measure correctly and test it. I actually only to half the amount of my aquarium, wait 24 hours, test, and see if it needs more.