I lost my precious little betta fuji last year to lung bladder disease and I am now considering a larger setup. Before, I kept Fuji in a 2g bowl that I cleaned weekly with a couple plants for the little guy to hide in. I also had a small heater to keep the temperature at 78 degrees.
I am pretty uninformed for a larger tank and love the smaller size of a 5g but was wondering what kind of filter and heater would be appropriate and if I could house an oto and a snail along with a betta in this setup. I am also considering springing for a 10g and starting a female sorority, in which case I would also like to know what kind of filter and heater is preferable and how many females would be ideal.
I want to do this right and really don't want to overly stress or harm the fish in any way. Any advice will be greatly appreciated. :)