I am sorry, but they just look so uncomfortable in there! Please do not attempt a saltwater set up in such a tank.
The filtration in this tank is not going to support saltwater fish. It's just wrong on so many levels.
Maintaining a small nano cube like mine is not hard at all, if you do what I do. I do a 2 1/2 to 3 gallon water change{and sometimes a bit more} EVERY week without fail. I use the great salt mix~Tropic Marin Pro. I top off every day, even though it's just a tiny bit.I use RO/DI water from my own unit. I maintain a 0 TDS{total dissolved solids} at all times. In my state, the water is bad..like liquid rock, so I use two carbon blocks, and two DI's.
Stability, not overstocking, and simple maintenance is the key to keeping a nano tank. My tanks rely on the live rock and live sand for filtration. No bioballs or such media is needed. I research each and every animal for compatibility, particularly my coral choices for the nano. I have a couple LPS, but overall my corals are not too demanding in that tank, so they don't remove too much needed elements before the next water change occurs. Unlike my 90 gallon which must be dosed with alkalinity and calcium every day, the nano does not need it. There are creatures for my clean up crew, that stay small, and each have a different job. Again ..NOT OVERSTOCKING and not overfeeding..is one of the most important, [and hardest thing sometimes] to do. My tanks stay at about 79-80 degrees F. Occasionally they may push 82*, with no detrimental effects.
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