PARASITES? unidentified reef objects

[smez69]

First post.. yay

Unfortunately it's not necessarily a positive one. I have some algae growing on the front viewing panel and I was watching my new astrea snail eating away then i realized there were weird tiny little bugs moving around. They seem to float and glide effortlessly on the glass and I'm not sure if they are parasites or something I need to worry about.

They are very small making a photo nearly impossible to get but I drew some diagrams of the three phases of this organisms life cycle.



I have had the tank about a month now and there is only live rock, some hermit crabs, two astrea snails and some random hitchhikers. Hope these guys didn't come with my LR.

Any suggestions as to what they might be? Help is greatly appreciated!