Well, after having my second fish go carpet surfing, again rescued it before it died I realized I need a lid of some sort for this tank. I am not killing fish this way. so I went to home depot and picked up one section of egg crate to cover one half of the tank, now I need to rethink MY return lines so they are amenable to creating a cover for the second half of the tank. I will post some pictures once I get it figured out.