I just dig a 2,000g pond in my backyard. Im goin to make a hole through the liner and put a pvc pipe through it so when its raining really hard down here in Houston, TX the water would drain out instead of over flow the pond. What kind of glue should i put in when I glue the liner to the pvc pipe? I got a waterfall at one end and drain the other end. I would put different kind of kois in the pond.A friend of mine gave me 150 butterfly kois fry right now in my 110g tub.