120 gallon tank that's been running for almost 4 weeks now. I thought it had cycled about 2 and a half weeks ago because ammonia had risen to about .25-,5 ppm
, And then nitrates appeared and then ammonia eventually went down to 0. I never saw any nitrites But I tested ammonia today and yesterday and it's hovering around .25 ppm
. It's not like there is a heavy load it's just some tetras couple minnows and 2 corys. Any ideas of what's going on or what I should do? I was getting ready to fully stock but I guess I'll have to wait. Is .25 ppm
really dangerous even though it's very low?