I found this critter in my tank about a week ago. With the help of some smart individuals on The Barr Report I was able to get an identification, a dragonfly nymph. I haven't been able to find him since to remove him. Turns out the little bastard will eat my shrimp and any small fish such as tetras. Always more lessons, make sure you do a good washing with bleach or KMnO4 before adding plants to your tank. Just thought I would share. Any tips on an easy way to remove it other than ripping my tank apart would be helpful.