I know a few people with huge 300+ gallon tanks that hardly ever do water changes.
Why? It's more stable and they didn't overload their tank with fish aka low bio load.
My neighbour is going on ONE YEAR for his reef tank with NO WATER CHANGES. Just keeps topping up with RO water. He has a 300 gallon with 150 gallon sump. 50 gallons of the sump is refugium. Has a good SWC skimmer which barely pulls anything out anymore thanks to the refugium. He has 6 tangs, 2 big angels, and maybe 8 damsels. Rest is coral.
He still has the same bucket of Tropic Marin salt from last summer.
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