You are wrong. Go type this in google like so many people seem to love "flatworm hatchling cycle". When you notice flatworms, they are several different ages by that time. They get so crowded in the rockwork, that they feel the need to come out. SO THE EGGS ARE OF DIFFERENT AGE!!! It would be cool if everything in your tank was the same age. Like all the snails were the same age, the fish, just everything. OMG!!!
That reminds me. I used it 3 days ago. 2 weeks ago, 6 weeks ago and then again when I first started the dosage at 2 months ago. Directions require 4 drops per 5 gallons. I add about 8 drops per 5 gallons and have a pound of Kent Reef Carbon Ready and a 30% water change. Yet they miraculously keep returning.