Strange looking critters on the glass

[Baldy]

Hello all,

This morning i woke up and was checking out my tank when i noticed 2 little things on the glass. Its kind of hard to explain, but they look like tiny starfish. theyre less than 1/2 inch across, and instead of 5 legs, one has only 4, and the other has 2. I noticed one of these guys when i was putting in the LR as well, and he only had 3 legs, around the same size.

Any idea what they could be?