I know i said this earlier but this is what i should do?
put in old gravel, decor, plants and let the old filter media float in the tank alongside the new sponge filter running. (with the zyme live bacteria) sprinkle in fish food every day and wait until the ammonia and nitrite levels reach zero with nitrate ranging from 1-40 ppm. (not over 40, if so do a water change)
Last questions:
Do i have to do water changes? if so when and how frequent?
What plants do you recommend? for the eco-complete substrate, being with a Betta, 5.5 gallon tank and low maintenance.