I think i need to get my new betta, Ivan, a heater. he mopes around with clamped fins all the time. his tank is only a few feet away from bagel's and they're the same temperature. bagel is fine, but i think he might be used to a bit warmer environment.
so tomorrow i'm going to go look for a heater. any suggestions on what a good one is for a 2.5 gallon tank?