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Thx sundacolugo .
Thanks for dropping by music & chookies. I will run sea urchins by my son. The water was really pretty I agree.
Sea urchins have a round spiny shell...
Although I have no idea, they could be some kind of sponge, cinderfire. Beautiful blue water.
Aquarium view-not sure what the spiny things are, and the kids forgot to ask. Anyone have an idea??