Raising pH in fish tank for spirulina algae?

Question

I am trying to grow some Spirulina algae in a 10 gallon fish tank for a school project of mine. From what I've read it prefers a pH of 10-10.5. What is the best way for me to raise the pH?

Also, can someone provide me with the exact ratio of water and base needed to reach that pH with approx. 9-10 gallons of water? I have an electronic pH tester coming in the mail but I need to get my algae in a tank asap as it has been sitting in a test tube for a couple days now.

Answer 1

"If you want to go the chemical way, the safe approach is to alter your pH by changing your kH. Instead of buying products like "minus-ph solution" or "plus-ph solution" (note: those mentioned are fictatious produces cos I dont wanna offend any brands) that are acid or alkaline solutions, look instead for KH buffer powder. When you get the KH powder, there should be an equilibrium pH value on the label. Look for an equilibrium pH value that you are aiming at."