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Tough question. Personally think it depends on what corals your keeping. LPS and soft coral are more forgiving with dirty water but many SPS are not. I have a mix of all and perform a 10g water change monthly, not exactly every 4 weeks just every month.
I dose Kent mag, ESV Alk and ESV Calc...
I never followed through with this order as I decided to wait for BF / CM. they are doing large percent off on some items but realized they now want $6 for heat box plus heat packs and $4 for FedEx/UPS mishaps. So an additional $10 tagged to the $40 shipping. Not sure its worth ordering from...