You need to be waiting at least a week before putting fish into a new tank, and use CYCLE or similar bacteria culture, or a piece of filter from an existing tank, to get yours going.
Fan tails are extremely sensitive fish due to their intensive breeding and I would say dont put one in until the tank is a good 6 months old. Start with some hardy fish, just 1 or 2 to get the tank going. And dont overload the tank. Bio-orbs arent brilliant tanks and goldfish are very messy fish, pooing out most of the food they eat. Id say 4 is probably the most you can expect to get in a bio-orb.
Also with live plants in goldfish tanks they tend to eat them and create even more waste.