I have Dr. Tim's for Cycle 2 tanks (40 and 125 gallons) - this was my choice as I've had a lot of trouble finding ammonia that doesn't have a detergent in it. When I first started riding my 125 I had about a bottle and a half left after riding my 40 gallons. Let me tell you - adding 2 drops per gallon to a tank this size takes forever! This container gave me a measurement of 20 gallons (one cap equals 120 drops) which was MUCH faster and easier to apply. I don't necessarily recommend it for small tanks, but it was a godsend for a large tank! The cycle ended successfully and my fish are happy and healthy!
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