Using coral in tank

Give it a healthy and thorough soak, and you're in business. Anything aragonite based will do a nice job of keeping the pH elevated.

Up to you. You can tie it into the aquascape or break it up and run it inside of your filter. The buffering capabilities work just the same.

I use crushed in both my 420 gallon tanks its the best thing I ever did it keeps my PH at 7.0 even between weekly water changes.I added 40 pounds to each tank and i am going to add another 20 to keep it at 7.2 to 7.6 my fish seem a lot more happy with the higher PH the only thing that I noticed is it starts to break down as it buffers and some white cloudy stuff comes out when I vacuum.my water was always piss yellow in PH before the coral.The big piece that you want to put in will probably work check Ph after a day or two if not high enough you can add some crushed coral,it might buffer more crushed because it will break down quicker. It does not cloud my water because it settles under the red river gravel that I all ready had.