I have a 300 gallon tank that I am going to bury to make my resevoir for a pondless waterfall. Probably just put a liner across the top to drain into the fill port. With so much capacity I could mave a good amount of water. I was hoping for some good ideas for what to use as a waterfall to make a good amount of noise. I dont have a lot of room to make a huge mound to go high for the waterfall. Got any recommendations?