It's a little tricky being such a small volume of water. You'd think I was crazy if I said I haven't tested my water in over a year. I dose Kalkwasser and Cal along with weekly 10 gal WC which is roughly 40-50%. I know the tank runs high in nutrients because algae grows everywhere I cant reach. Not GHA but bryopsis and other macro algae which I don't really mind as long as it doesn't get close to the corals I think it gives a more natural look. My guess is the macro algae helps with overall tank health.
It's a Biocube, I don't have a sump or any outside filtration attached. I run a NS-80 skimmer and have a little mangrove in the middle chamber with some of that blue filter sheet stuff. As for flow, I run an mp 10 at 100% pulsing flow, 2 3rd gen Hydor powerheads (2450gph) and return which isn't much.