First of all there's noting in the tank but plants and a few snails that came on some of the plants I ordered a while ago.
Here's a picture I drew of it since I couldn't get an actual picture or video to show the thing:

That first picture is what it looks like from the side when it moves. It moves like an inchworm.
The upper right hand picture is what it looks like spread out.
The lower picture is what I think it would look like from the top while it's inching along the glass.
PLEASE PLEASE PLEASE HELP!!!!!!!!!!!! 8[ I don't know if there are any more in the tank or not. 8[
To all those I'm friends with on here I LOVE EVERY ONE OF YOU!!!! <3 I'm sorry I haven't been on much lately but I've been so busy I barely have any free time. The Green fee I'm attempting to establish at my school is taking up ALL of my free time. ALL OF IT. It's worth it but I hate that I can't lounge on her like I used to. :[ I love all of you and when I get my tank set up I'll post pics. (literally setting it up in the morning as set-up didn't get to happen today.)
Oh and I've had my plants in just plain dechlorinated water for forever and I still have the majority of what I ordered! =] a lot of it is growing too so I don't NEED MTS anymore! =] (though I still really want some just in case. working on ordering those... And just today I discovered pond snails!!! :D SNAILS!!!! <3 Not the kind I was expecting and planning for but I'm so happy that there's life in my tank! <3
Unfortunately this unknown creature instantly crashed my snail-happy with dread. :[
Can someone tell me what it is, if it's a parasite, if I need to kill it? I'd love you forever! <3