I just bought some duckweed and placed it in my bettas bowl and my fiddler crabs tank. Neither of which have filters. Do you think this was a safe and good idea? I know duckweed is a freshwater plant and I did put it in my crabs murky tank. Neither of the pets would try eating it, would they? I know that they're both carnivores. I read up about it before I bought the duckweed but now I forgot a lot of the information, and I'm just hoping I didn't make a mistake. Thanks!