It has been two days since I moved the Celestial Pearl Danio from the 5.5 gallons into the 20 gallons. Today I was contemplating emptying the 5.5 gallons, but the idea of a shrimp tank seemed attractive so I left it standing. I moved my Marineland 100B filter to the 20 gallons as well. I just opened the lights and I saw tiny microorganisms skimming along the surface. Could these be newly hatched fry? They are moving along the surface as if they are swimming. They are very very tiny, I cannot make out what they are.