I have noticed some tiny, tiny lice type things on the wall of my fish tank?

[AMY S]

There are lots of them, maybe 20-30, and they are sort of white/see through. Two of my mollies have had babies over the last few days and I have put them in a nursery tank which floats on top of my fish tank. These weird things appear to be situated between the wall of my fishtank and the nursery tank.

Could they be little baby fish from another fish in my tank such as one of the neons or a tiger barb? Or could they be some sort of bacteria or lice? I don't want any harm to come to my fish so any help appreciated.