Huge Betta set up (Ocala)

I have a 20 gallon and two 6.6 gallons 6.6 don't have heater filter there's two tetras and two other breed of fish I have a copper half Moon male Betta red copper half Moon Male koi mermaid half Moon male Betta comes with blood worms the food for the tetras fanfics all the plants and set up in the tanks breeding mesh breeding box two extra filter cartridges and a siphon these are top blood competition Bettas