You should try to test his water with your test kits and see the reading. My tank is about the same size as his, I also use Mag 1800 and I have not cleaned it for months. I did not clean my return pump for 2 year with my old one until the front plate got broken :-)
I dose around 80ml for both calc and alk with Randy recipe. But only have small- medium sps corals right now.
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