This tank is many years old. Now I want to try to create an unusual system in it. And it won't have live rocks. The main task that I have long tried to solve is to create a system in which plankton can live. I will tell you why I need such a system later. Now, here's the beginning. The tank is 60 liters, glass 8mm, instead of argonite sand I use crumbs of sea shells. We sell it for feeding chickens.