I'd like to use Tom's Internal Filter which is an internal multistage filter, but I'm not sure if I'll get any oxygenation.
Background: I now have a three gallon tank and I'm trying to figure out what to do with it. Plants, shrimp, a snail and maybe a betta. I'll be cycling the tank with just gravel and plants for a month before I add anything other than a couple red cherry shrimp. I'm trying to avoid having too many stuff/wires in/around the tank. Will already need the wires for the filter, thermometer, heater, and lights, I don't want to add bubbler to the list if I can help it.