I dont dose in my "FOWLR"....which has tonnes of easier corals in it from my old reef tank. Didnt have the heart to sell them. Just a 40 gallon water change every 2 weeks. Been going for about 6 months and everything has been just fine.
I find as long as theres no harder SPS, they can tolerate the alk swings between water changes.
My SPS system would show white burnt tips in a week or less if I didnt dose.