One point I give with nanos.... Anything you do to a small tank is exponentially more noticeable. For example, less water has little room for chemistry errors.
Evaporation is ten fold. If you don't top up daily you will have spikes in your salinity. Which could be harmful.
Temperature. In summer the tank will heat up more rapidly then a large body of water. Temperature spikes can kill your corals and fIsh if not monitored.
Good luck. Looks ok so far.
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