A 10 gallon is way too small for a beginners saltwater tank IMO. Especially when they are a beginner to keeping fish in general. In a tank this small, it is very easy for the water to become unstable and a tank to crash. Takes a lot of work and know-how.
If you want saltwater, I suggest a 40 gallon minimum tank to get used to caring for a marine tank.
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Current setups: 1800 gallon koi pond, 10 gallon planted, 150 gallon reef, other FOWLR tanks
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