Wow, that's a unique shape.... You could have fun with it.
I've kept pieces of it out for a year or two and have never had any troubles with it. I would assume the green is probably algae or something similar to it. I was going to suggest boiling it before use, but I bet you don't have anything big enough to boil it in. :wink: At any rate, I'd do something (soak, rinse, etc.) before putting it back in the tank.
I've kept pieces of it out for a year or two and have never had any troubles with it. I would assume the green is probably algae or something similar to it. I was going to suggest boiling it before use, but I bet you don't have anything big enough to boil it in. :wink: At any rate, I'd do something (soak, rinse, etc.) before putting it back in the tank.