Frist of all can anyone post a pic of coral, i think i have a coral(rock with holes) from my mate. How much do you put in the water to buffer the kh/ph?

Here's a couple chunks I brought back from Hawaii. The only
downside of trying to use it, is that it has lots of junk and stuff
found inside. You would be better to use stuff from a pet store
or try a feed store for chicken grit. The pet store stuff is steril
and is in small pieces which will allow you to adjust the amount
you want easier.

Thanks i think i'll use ph buffer instead lol