Top up ammonia every time it drops to 0 ppm.
Check the nitrate and see if that is slowly rising on an every day basis. Sometimes, the nitrite->nitrate bacteria grow much faster than ammonia->nitrite bacteria, so there is never a nitrite spike.
Check the nitrate and see if that is slowly rising on an every day basis. Sometimes, the nitrite->nitrate bacteria grow much faster than ammonia->nitrite bacteria, so there is never a nitrite spike.