60 Gallon Cube Aquarium HELP!
I have a 60 gallon cube tank that has a black plastic water spillway thing in the back of it (not really sure what its called) and a small clear hose comes out of the top of it. What is this hose for? Am i supposed to hook up an air pump to it? I bought this tank off of someone with no instructions. I just notice alot of times, the tank will gurgle (like theres air trapped) then it stops a while, then it gurgles again. I dont know, ANY help would be appreciated!