They aren't plastic, it is duckweed, which is REALLY great if you want them to blow bubblenests :3 Skye made me a present this morning in one of them. :)
the only bad part is, is that somehow a water spider got in my tank, I lifted a plant up and thought it was a shrimp, it was clear, then I saw 8 legs and freaked out O.o
oh well, either the fish have eaten him or he is chillin. He hasn't hurt the fish, though Spoof keeps randomly jumping up the filter current.
I swear my bettas are mentally ill sometimes, at least Spoof lol