Hello all, My tank has been running since Aug 26th....added the right amount of ammonia to get a 3.0mg/l reading.Have been checking ammonia level every other day,and all was well. But to day when i got home from work I checked ammonia level and it has fallen below 1.5.....(it's more like 0.25-50mg/l.I used a full dropper of 12 ml for the intial dose of ammonia....so should I use the same amount now or just add until i get 1.5? If bacteria is growing, I dont want to "kill it " by adding too much ammonia!