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Nitrite should be 0 if it was fully cycled, .25 isn't bad but indicates that the tank isn't cycled fully. More than likely you have a bacteria bloom that will clear up once the tank has been cycles for a few weeks. Keep up on your water changes.
A mini-cycle is common after first adding fish. However, I am not sure that a mini-cycle would commonly cause bacterial bloom.
I would keep an eye on it for a few days and see if it goes away on it's own. Just make sure the fish are behaving normally and not gasping for oxygen.