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A 29-gallon would be a good size for your molly, but I know that might be getting too big if you're hoping to stay more in the nano range. I really like 20 gallon longs as they have the length of a 29-gallon, so fish can zip around more.cgittelm1 said:Thank you, I'm planning on getting a larger tank - I recently learned this was very small for mollies (& feel terrible about it). Any suggestions on a decent tank size for beginners wanting multiple fish?