My favorite is probably my 7in eel or my 3in blue ram. I haven't seen my eel lately. He keeps burying himself in the substrate and staying there until I turn the light off. He's funny.

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20 Gallon
4 Neon Tetras
5 Red Barbs
1 Serpae Tetra
2 Scissor-Tailed Tetras
1 Zebra Danio
3 Skirted-Black Tetras
1 Clown Loach
2 Blue Rams
1 Eel