fish input?

In that small of a tank wouldn't add much more than maybe some small schoolers such as neon tetras, micro raspboras or glolight tetra. Depending on your plants, possibly a few rcs, Amano or a bristle nose pleco for the bottom.

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if anything get some more of the glo fish or tetra you already have. schoolers need to be in groups most of at least 6 to be really happy and most normal behavior.