So I plan to get an Aqueon 2.5 gallon tank for my huge desk, so I can look at the fish while studying. But does the kit come with a heater and filter. If there's a filter, I don't see any of the chain stores sell the cartridges. I might do one special betta instead of a sorority since its more complicated and riskier. So pictures of Bettas with types will help. Thanks.