lovely tank but you should get 3-5 more of that fish .. black neon tetra?
Also otos are a shoaling fish and do better in groups. Solo they tend to get scared (think something ate the other otos) and aren't as active/visible. A group of 6 is recommended but in a small tank you can do 4 (have 4 in a 12g long)
They will never see me coming...Wait, what do you mean I am neon orange! Taken with my note 3
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