It's fiberglass actually. Very thin and very hard to cut The plus is that it takes up very little room in the tank but provided space to hide all the filter intakes and heaters.
Here's an idea. Spend just a bit more cash to get another Silver or a Black in there as well. Aggression will likely be less. That or you could run the gauntlet with Jar and expect it and the Green to have spats for the whole first month. (Joke).
The plus is that it takes up very little room in the tank but provided space to hide all the filter intakes and heaters.