Hello everyone, I have just started up a shark aquarium in my 400 gallon system and I was told that and algea scrubber would help out a lot in regards to phosphate and nitrate reduction. Now I cannot spend a grand on a filter that I do see some have success with doing a DIY project. So my question is, does someone have a design to share and what size system do you have. If I am mistaken I would think mine would have to be built pretty large.