I have a 110 gallon with 55 gallon sump for total water volume of 165 gallons. I bought this internal overflow kit. It includes a 1in bulkhead and a 3/4in bulkhead. Both bulkheads have barb ends. I am guessing I will use that flexible piping but what size and where do I buy it? How to I secure the tubing to the barb fittings? Do I need any parts between the overflow and return pump or just a tube from under the tank to the overflow and another tube from under the tank to the return pump? Please help I have no clue how to plumb a tank