evercl92
Aquarium Advice FINatic
Probably just a comfort issue at the moment. I don't know how high of GH is too high, but my GH sits around 18. Presumably, yours would be a bit higher, since you have (essentially) the same water plus the CC substrate. A friend of mine only really had issues with his plants when the GH got into the 25-30 range, but he had limestone rocks in there for 2 years. Yours may not take as long, seeing as there is many more times the surface area on the CC.