new to hobby..........have 10 various tetras.....made common mistake of overfeeding in the beginning.........(lost2)......all has been ok for about 2 weeks now.......originally ammo was 2.0.....added ammo rid pack to aquaclear filter and some extra zeolite chips.........ammo dropped to 1.0..........i have done various 5 gal water changes......(30 gallon tank)....but ammo is still holding at 1.0........am i just being impatient and not waiting long enuf for good bacteria to take over or do i keep doing water changes to get ammo to zero??