i have a 20 gall tank with 1 red cherry shrimp 2 mexacan dwarf crayfish 7 zebra danios 3 ember tetras 5 glowlight tetras and 5 neon tetras. anyway, i was wachng the crayfish when i saw it picking at somthing in the gravel. i looked at the gravel and saw a tiny worm like thing, i caught it and put it in a 1 gall tank. it was just sitting on the bottom but now it is swimming like a fish WHAT IS IT?!?!