It sure is… playing with kalk trying to keep my ph over 8.3… I normally run it at 9 but I want faster growth I got a huge tank to fill lol.. I haven’t seen any ill effects running this high and I’ve always used reef crystals myself and still do… I do a 40% water change and it still stays 9ish… I bumped it all purposely to see if the corals responded with better growth or not.Is your Alk really that high? Some of my torches have BJD and I was told it's the alk being at 14 being the cause of that. I blame reef crystals. I have now have it at 8.8 - 9.4 at the moment.