So I've been cycling my tank for weeks now, and things were going very well before I messed it up by playing with the filter. I've tried water changes which get all my readings down to to perfect, then when I dose with ammonia again, the ammonia is getting processed within 24 hours, but my nitrites stay sky high. I've got lots of nitrates, so I dont know why my nitrites wont go down without a water change. Ive dosed with tetra safestart to help, but my nitrites stay high. What am I doing wrong??