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- 5 years
or 2 pea puffersBoth of those species will be much happier in a 20 gallon. So I would suggest doing it! In a 20 you could keep shoals of both those species, and introduce a small shoal of another nano species. Go even bigger, and you'll have so many more stocking options.
You could then do something really cool with the 10 gal. You could divide it in 2-3 and keep a few bettas. Do a shrimp breeder and have a massive shrimp colony. Keep a single pea puffer... so many options.
Is that your stocking for the 20 gallon? Cuz that would make a nice 20 gal. Cardinal tetras and cories both don't fit in a 10 gallon. If that were the 10 gallon, it would also be very overstocked.