I have some bugs in a tank I bought second hand, really need to get rid of them they are creeping me out. I've tried to take a pic but my camera isn't good enough. They seem to live on the glass at the top and jump across the water. They're really fast, some look a greeny brown colour but then others look white. I've took the lid off and the sliding glass lid, cleaned the lid with a cloth with a bit of bleach on and the glass lid I've put in the bath and showered it off. I've filled the tank up so they can't stay under the glass brace bit that goes around the top and have been wiping them off the top of that bit, but they're so fast as quick as I'm wiping they're jumping back in the water. I'm a big baby when it comes to creepy crawlies, they've got to go, what else can I do to get rid of them? What are they? Thank you