I have figured out almost everything about how to use our current components to make my filter work thanks to everyone's help but I still have a couple of questions. Our PVC corner pipes have one small hole on each pipe. The hole is on the inside part of the elbow. When we put the hoses back into the tank, the holes are aiming into the overflow part of the tank. Will water come out of that hole and back into the overflow? Will it matter if the water from the hole goes into the overflow? Thanks for any help on this matter.