So, My betta has finally recovered from his bout with fin rot and it has made me want to upgrade his tank to a 15.125 cube rimless tank. Filled to the brim it would be almost 15 gallons, so I'm guessing at average real fill depth it'll be 12.5 to 13 gallons. What sort of accessories do I need? What brands do you suggest? I want to make sure I have everything I need before I transfer so everything will go smoothly and I won't shock him, especially after he's just gotten better.