Join Date: Oct 2010
Location: New England, USA
There are a lot of choices, but it depends on the size of your tank. If your tank is a 1-5 gallon, a snail might be a good choice.
In a 10 gallon, you have enough room for 5 pygmy or 3 bronze cory catfish.
Remember when stocking your tank that 1 gallon water = 1" of ADULT fish, so:
10 gallon: 1 beta (3" adult size = 3 gallons), 3 bronze catfish (2" adult size = 2 gallons x 3 = 6"), with 1" (1 gallon) 'wiggle room'. Add a snail!
Your tank may look empty at first when all your fish are young and small, but they will grow quickly. Keeping the bioload low means your fish will stay healthy, your water quality will not deteriorate quickly, and if your fish is stressed or injured, it has a better chance of recovery.
Overstocking your tank leads to toxic build up in the water at a rapid rate, poor health and less ability to recover from injury. I learned this the hard way - so chose your betta's tank mates wisely, and everyone will be happier in the long run.
20H: 2 Cory Catfish, One very mellow Cambodian female Betta, Two Golden Veil Angelfish (male and female)