Black leech in marijuana hydro solution

A question from a fellow grower:

I have a concern went to check my babies and in the hydroponic solution I found little black leech looking things in there moving around any idea on what they might be, they are moving to. I sent a pic along with email any information would help

Wow! That would weird me out! Can you get a better picture? I don’t have any ideas as of right now and can’t see any detail of the thing in the pic as it is now.

I have never seen that before. I can’t see well in the 1st place, but a clearer picture would definitely help out; As far as identifying the bugger