Rule if thumb 1 in fish per 1 gal. If u get more fish make sure u have room for em or they will be stressed out for lack of roomI currently have two guppies (the female & male) & 3 Corydoras. 2 regular sized & 1 pygmy. I also have 3 snails.
I had plans on getting more fish for it but I don't wanna stress out the female with new fish.