[cturner]

Yeah get rid of the crushed coral. It's raising your PH, GH and KH. Just to give you an idea of the difference measure your PH, GH and KH out of your tap and compare it to the levels out of your tank. I bet there is a huge difference, then you would be able to try different plants. Plus you might want to try a fert schedule too when you get your water parameters a little lower.