Jellyfish Vs. Copepod

This will give you a size comparison

Another shot of the Jellyfish, this time in the gravel. You can see polyps underneath (or on top depending on how you view what is right-side-up on this jelly), ready to pick food out of the water that happens to float by.

This is one of the Scyphozoan Jellyfish in our pico-tank that we found clinging to the glass. They seem to like to attach to the glass on their backs and only move like jelly's when they move from one location to another. The pico-tank has become more of a science experiment than an aquarium, since we are trying to keep these guys alive out of shear curiosity of how big they will get.

A truly weird thing!

[More videos from Sparky477]

I shot this Scyphozoan Jellyfish through the microscope after sucking him up with an eye dropper. He actually is swimming around in a drop of salt water if that is any indication of how big he is. Unfortunately I only have one objective lens in the scope and I could have done with a little wider shot, but you can get the idea of how this guy swims by watching the video.

Scyphozoan Jellyfish

This is a photo of a Scyphozoan Jellyfish that is another hitchhiker in our tank. He's visible to the naked eye and swims with a pulsing motion just like an adult jelly. I've read several different sites on Scyphozoan Jellyfish and they say this one could grow to adult size if fed properly, but I've never seen one in my tank grow any larger than the size of the letter O. The fish seem to ignore them and I suppose they are to small to be a pest, so at this stage I'm going to leave them alone (not that I can get rid of them since I don't know where they are breeding in my tank.