06-21-2012, 08:54 AM
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If you want a tankmate for your new friend, I recommend a single snail. They're voracious eaters, and a 3 gallon probably won't even satisfy it. I had a single Apple Snail in my betta's 4 gallon tank, and I still had to supplement its diet with algae wafers.
Unfortunately, my betta kept picking on my snail and nipping at it whenever it came out of its shell to feed, so just keep an eye on your betta for aggression.
I do not recommend any other tankmates for a betta. That tiny algae eater you mentioned was probably an Otocynclus Affinus. They require a minimum tank size of 30 gallons and require a shoal of 3 at minimum. Please do not put any other fish, frogs, etc., in the tank with your betta.