Water changes

[ReefOcean]

I should also add (without trying to force this thread in multiple directions) is that you can achieve some of those things you have described to a degree. Stocking fish that eat stuff that grows in your aquariam, living in a hot climate, having a clean up crew... are all things that can help wirth the enclosed system. Obviously, and it is a big obviously, there are still many things you need to do to maintain the tank like clean equipments, suppliment feeding here and there....