I'm becoming addicted to my betta fish; I'm constantly trying to redecorate his bowl with ornaments.
When I bought the bowl I figured I'd keep it at just a single betta but now I really want to add something else in there so my question is:
1) Is it ok to add another fish in with the betta I have now or is a 2.5 gallon bowl designed to house only a single betta?
2) If it's ok to add fish, what types of fish can survive in a bowl without a filter?
Its looking like I'm going to be upgrading to a full-out aquarium soon. It is addictive.