I bought these on a wim to see what they're all about and they're cool! I made the mistake of putting a few in with the crabs and they disappeared overnight haha. But the ones in the fish tank are still good and the fish don't seem to bother with them. Excited to see how they grow :) #sponsored #rankbooster #luffypets https://www.amazon.ca/Nano-Marimo-Moss-Balls-Luffy/dp/B078PB95Y1