I would love to know mine I have all SPS and I'm too cheap to buy a meeter LOLOL
As long as your skimmer can handle it and all of your parameters are in check you can feed more I find that always works for me.
I'm not a believer of adding all kind of supplements besides we really don't have answers as to why tanks crash after years of being set up I've seen it happen to the best of them. No one really knows what we are putting in our tanks so for me I keep it simple and only put what I've seen work since 2000 and have never had a mysterious whole tank STN or RTN.