Finally tired of battling the alge and decided to add a bog to my existing pond. I currently have a biological waterfall not doing the job. I am replacing it with a Laguna Heavy Duty Preformed Pond 51'' x 32'' x 18'' 108 Gal PT795 tank that I will make into a bog. I could use bulkheads and PVC for the dischagre back into the pond, but really enjoy a sheet waterfall. Any ideas how to add one. Existing commercial options welcomed. I have attached a photo of what I'm trying to do, but cannot find the parts. Thanks in advance for the advice.