Best oddball for freshwater tanks

9 species in this category on Fishori. Open a profile for tank size, temperament, then run pair checks before mixing.

Oddballs are the species that do not fit any community shape: puffers, knifefish, snakeheads, freshwater eels, and a handful of other specialists. Each is its own research project. Diet, lighting, tank mates, and even substrate choices vary so much across this list that copying a friend's setup with a different oddball species in it almost always fails. Read the species page first, then look for a second source that agrees with it.