So.....I think I need to use a buffer of some sort. I have 3 tanks. 2 have shrimp and fish. The other has dwarf crayfish and fish. I understand that my kh needs to be 3-5. To get my kh to 5 with Eqilibrium in one of my tanks, my gh was 28. Yes, 28. That is obviously not good. So.....Can someone explain to this lawyer (not chemist) what buffers do and which one I can use to up the kh without upping either ph or gh? Fyi.....ph is 7.6. And I only use RO water. Don't know how that happens, but would love to understand. Every time I think I understand, someone says something contrary to what I thought was correct. Thanks for the help!