I have a 40 breeder with a Fiji cube overflow on it. It’s super loud! I bought the tank used and it only has a pipe for the emergency drain but not for the regular drain. Is this how the kit would have come from the factory or am I missing something? Water coming into external overflow box falls about an inch or so before reaching the water level in the external box and then down the drain line. Is the fix as simple as getting a piece of pvc pipe for the main drain and raising it up to just under where the water comes in from bulkhead on tank?