My 10 gallon tank is overstocked so I would like to get a 5 gallon to move my betta in (with the betta gone, the rest of my fish should be okay)...
When I check petsmart and the like, all the 5 gallon tanks are those silly "kit" ones with built in filters that I really don't want - does anyone know where I can find just a regular shaped 5 gallon tank, and then a hood to go with it? I'm pretty sure I'm just going to go with silk plants rather than live plants for once, so lighting isn't a big deal.
Also, what kind of heater should I get for a 5 gallon? It isn't a lot of water so I don't want to overheat the tank! And as far as filters go, I know bettas hate a lot of water movement so what filter would you recommend as one that doesn't disturb the water too much?
I'm running low on money so I'm researching the cheapest options available

I just want to make my betta (and the other fish) happier by giving them more room and help the bioload lower a bit.