I have a 5L plastic bowl thing that i chuck all my trimmings in mainly, ricca that i use around my house plants. I decided to change the water in in for new old tank water and found 3 fry either CPD's or Dario Dario and an easy dozen baby RCS. The fry look like eyelash hairs with eyes and the shrimp 1/2cm to 2cm so they are all very young. There have been many other threads about people finding fry or fish that have raised themselves in nearly empty tank with inches of water. I was wondering do you think it is possible that we try too hard when we raise them ourselves and? why is it they can thrive and even breed in old dirty water but not in that nice clean water we give them?