Hello, I am new here and I need advice. Just set up a new 3 gal tank ( I know that is very small) for a betta. Ive had other larger tanks before with the standard hanging filter...never dealt with an underground filter. Is the cycling process any different? Is the gravel substrate actually the filter media since there is no filter cartridge? Any advice would be greatly appreciated. Right now tank is up heaters running and filter is running of course no fish in the tank. Thank you for any help.