this is the algae tank at the moment. it is pretty much just a shrimp tank at the moment. i tested its abilities to support fish, and it turns out that it is the best thing since sliced bread when it comes to raising fry. nothing in my experience beats it. anyway, every time the algae grows out, i pull as much as i can off of the wood and it just grows back nice and thick. i then put the excess algae into tanks for raising fry. works great.