Not positive about the toadstool, but I'm pretty sure you are right about the flowerpot. Good luck with that thing. I've never heard of anyone keeping them for long. Apparently they like their water a good bit harder than other corals. We bought a rescue (we always like to do that) not knowing the details, and while it wont completely die so I can just toss it already, it also wont grow, won't open, and just kinda sits there glowing neon green. Jerk.