I was looking in my tank today and happen to see something moving on the substrate. We were able to suck it up with our vacuum. I can't take a picture of him so I will try to explain him as best as possible. It has the head of a praying manits, with large eyes. It's body is a tear drop shape, and it has 6 legs. It's colour is kind of beige with bits of black on it. It is only about 1cm long. It "swims" very fast, does not glide on the water. It's back end seems to stick up in the air with two little points on the end. I did a vacuum yesterday and seen no other things that would make me wonder what was picked up. What is this, or what subject could I look up. It is deffinatley not a shrimp.