Quite a bit like that but I couldn't see any antennae , they look like a teardrop almost. I don't think they are planaria, or worms of any sort. While doing the water change I saw a couple trying to escape up the glass sides. But there was no water. they was just a thin film of water on the glass and they were trying to walk up it. I don't think a worm could break the surface of the water could it?
I'm just happy their numbers have been greatly reduced. I'm going to do another water change in a couple of days.