Ok, just found this forum as I was searching to try and identify the attached something that I noticed hanging at the surface of one of my tanks last night. It's about 3 mm (1/8 inch) in length and there seem to be a few more of them, but smaller, in the gravel. The tank is a reasonably established 3 gallon occupied by 2x platys, 2x mollies, 2x neons and 2x African dwarf frogs who all seem to get on well together. The only recent addition has been a live plant which donated a few snails and (I guess) these guys. But what on (or off!!!) earth are they???