Blossom, do they look like the 4th picture down here? http://www.xtalworld.com/Aquarium/hitchfaq.htm
Thanks Grins, that was a great link! There were a few things on there I have seen in my tank and didn't know exactly what they were. Limpets being one of them.. I always described them as "barnacle like" but I could never figure out exactly what they were. I have heard the name Limpets used before, but never put 2+2 together. I also have a bunch of stomatella varia that I thought were just baby turbo snails still growing a shell. LOL.
Now I just need to find out what my bad little clear/white anemones are.. not aptasia, tentacles are flat/clear with white dots at the tip.. not pointing upwards like the white/clear aptasia pics I have seen.