Angels get a bit large for a tank that size. Especially if you want a variety of things going on, I think your best bet is very small fish. The danios you have, or the Harlequin rasboras...they really are gorgeous, and add great movement in a tank.
Dwarf corys and otocinclus are fun to keep if you have enough room for 2-3 or more, they have very cute social behavior and much prefer to be with more of their own kind. I have 4 otos in my dwarf puffer tank, and they huddle together during water changes, makes me smile every time. Do some reading on each fish you're considering and be sure to look at size requirements for each. There's always compromise with small tanks, but there are great options with nano fish. Our 10g has always been one of my all-time favorites, despite the size limitations. I don't remember if I mentioned it before, but von rio tetras are fantastic looking and stay small, I love them.
Dwarf corys and otocinclus are fun to keep if you have enough room for 2-3 or more, they have very cute social behavior and much prefer to be with more of their own kind. I have 4 otos in my dwarf puffer tank, and they huddle together during water changes, makes me smile every time. Do some reading on each fish you're considering and be sure to look at size requirements for each. There's always compromise with small tanks, but there are great options with nano fish. Our 10g has always been one of my all-time favorites, despite the size limitations. I don't remember if I mentioned it before, but von rio tetras are fantastic looking and stay small, I love them.
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