Ah, that's an Eclipse 6....about six gallons.
You want ammonia to be at 0, but it should rise during cycling and then fall back to zero as beneficial bacteria accumulate. Then nitrites will rise and eventually fall also, and you're left with an excess of nitrates. Nitrates are less toxic but you don't want ammonia or nitrites in an established tank.
I'd suggest only a betta for this tank. They're easy to care for and do make pretty inhabitants for small tanks such as yours.
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Current setups: 1800 gallon koi pond, 10 gallon planted, 150 gallon reef, other FOWLR tanks
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