I’ve had a baby Betta a little over a month. She’s in a 5.5G tank by herself. The tank finished cycling I believe this weekend. Nitrates are I believe 10-20, definitely less than 40 ammonia and nitrites 0. When should I do a water change and how much? Should I wait for nitrates to get to 40 or above, and if they do get above 40 should I treat with Prime or just use the conditioned water with a water change?