My water has a ph of about 7.5, a GH of about 75-150ppm, and a KH that ranges from 0 sometimes all the way to between 40 and 80 ppm. I have come up with the conclusion that my water lacks calcium and the hardness I do have is magnesium because the snails In my tanks have flaky white shells and my java fern seems to stay small and some leaves look oddly white. I am dosing easy green, but it doesn’t have calcium. I am mainly concerned with my stem plants because I rely on liquid dosing only for them and I don’t want to lose them. I also like snails so I would like them to be healthy and I’m sure the fish need calcium too. What would be the safest way for me to add calcium to my aquariums so that the amount is steady and not drastically shifting my water parameters, stressing out fish? I’m not entirely sure crushed coral is good for me because my ph is already a bit high, but I still don’t know how it works completely. I would also try egg shells, but I don’t know how to do it or how safe/effective it is. I’m completely stumped and some help would be greatly appreciated 🙂