Wow! Don't you miss feeding your fishes, though? That's such an enjoyable part of the hobby for me.My previous reef tank never needed a water change after it reached 6 months old. It self maintained and the fish never needed feeding either. I used 2 canister filers, a trickle filter, uv steriliser, metal halide, denitrator, protein skimmer with ozone and auto top up. Everything flourished, corals grew, fish grew, it was like a perfectly balanced ecosystem and no additives were needed. So, in my opinion it depends on what equipment you have