Hello! I am planning on getting a bimac, so i can hug him and love him and name him george, now, the pet shop where I live is selling 50 gallon "pre drilled" aquariums, they are like kinda rectangular, and in one corner theres a square area blocked off, with the top part of it kinda ridged, and a hole at the bottom. Now I Suppose this is used to hold equipment or something, I just cant figure out how itw ould work, and why theres a hole in it. I was thinking of getting one, but theyve been treated with copper, which would kill george, can that be removed, or if its ever been treated theres nothing you can do? And could you describe the operations of that lil square thingie? Second, is there a complete idiots guide around here, telling you what you need for a bimac, what equipment how powerful, how to set it up, if your knowledge is limited. Thank thee!