My first post here. I bought a 3 gallon glass tank (10"w x 9"h x 8"d). I plan to house one male betta, and possibly a couple of pygmy cories and/or amano shrimp, post some more research.
I am looking at a filter similar to this, but it has 6 compartments and not three.
But the guy at the LFS says that even though this filter creates the least amount of water movement of the models he sells, it will create too much oxygen in the tank, and the betta won't like it. He recommends a smaller and cheaper submersible power filter with an adjustable flow rate. Problem is that the filter he recommends has a sponge and no room for any other media... I'd like to have an over specified filter, so that I won't have to do water changes more than once a week. SO - is it true that bettas don't like too much oxygen? I do know that the don't like water movement... but oxygen?
About the heater - my work space is air conditioned and fluctuates between 70 and 80 degrees through the day. Do I need a heater? This
Elite Submersible Pre-Set Aquarium Heater is the smallest heater I could find with a thermostat, but I see warnings that if it malfunctions, I will be dealing with betta soup. SO - 70-80 degrees / 3 gallon tank... heater or no heater?