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I would hold off on an ATO until you get more familiar with everything first honestly. I have a 65gal tank with a DIY acrylic lid and I only have to top off maybe half a gallon once a week. Start simple and work your way up.Would I need an auto top off with the biocube since it has a tight fitting lid?
You can use tap for fish only systems but corals like better water quality and most tap water has an allowable amount of minerals in it that does not work out for sensitive coral species. Recommend using RO/DI water for salt mixing for favorable results in a marine tank.



