Getting another tank for Christmas (I currently have a 5.5 gallon with a male betta, a mystery snail, and 6 neon tetras who all get along perfectly) and I'm thinking about creating a divided tank for 2-3 males.
I just have a question about the tank set up. If the filter is on one side, will it properly filter the whole tank? I intend to muffle the outflow so it doesn't bother the bettas too much. Also, the heater: would it be best in the middle of the tank so that the heat can spread to either side?