Hi, thanks for your help thus far. I was using an x40 objective lens with the camera which I believe has no magnification. I had to sort of stick the photos together. The Seahorse is about the same size as the other thing. I stitches the photo of this up:
I also found a clump of circles, don't know if they were eggs or not, but I lost the photo I took of it. It looked a bit like this: