Yes, they were all on the gravel. It is squishy feeling. I squeezed the LFS water out of it. Maybe that was why ... Here is a pic
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Nice looking setup there! Just like a sponge, you can give it a little squeeze and release... that should allow it to soak up more water so it will stay on the bottom. An interesting read if you want to check it out; http://en.wikipedia.org/wiki/Marimo