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15 gallon is too small for any octopus. They need to eat much more than other inverts, therefore they produce more waste. Also, they are very intelligent and need more to look at than the inside of a tiny aquarium. They like to explore, redecorate their home, and change hiding places. Keep reading and
If you can get your hands on one, O. Wolfi is a very small octopus that would do great in a 15 gallon. The problem is, since they are so small their lifespan is very short. Most live only 6 months before