if the tank has been sitting without an ammonia source for three months then i would say it is not cycled any more. zero ammonia, zero nitrites, and zero nitrates say it is not cycled. as i mentioned, that many plants would not account for zero nitrates.BettaFishMommy:
The tank was cycled with a combination of Tetra SafeStart and fish food. The tank has also been sitting for three months after the initial cycling, and ammonia is 0.
put some fish food in the tank or pure ammonia in the tank and test for ammonia 24 hours later. if you have anything other than zero, then your tank will need cycled again.