460 is fine. You don't have anything that will really eat up calcium at this point. But even if you had a bunch of sps
, 460 is still good.
My recomendation to you is to stop buying coral for at least a month. With all your new additions, your water is all over the place. You need to do a bigger than normal water change and test.
I would test ph, nitrite, nitrate, ammonia, alk
, calcium, and magnesium. You need to have these tests on hand. Take a break from buying and let water stabilize. Then you can get back to your addiction (at least a month).