Originally Posted by BLC1
Also, I think the area I am working with is bigger than what most of those are. Would you suggest just building it with bigger rocks to fill the space?
With a good sized pump (I usually use about a 5200gph pump for boulders with two 2" holes) you get great sound. Especially if you have walls near by that you can get the echo effect off. I like to install ball valves in each pipe so when you turn them on you can adjust so the holes have about the same amount of flow, or you can just turn them both down if you have too much pump.
One thing to keep in mind in the pictures they don't look like they take up too much space but you may want to factor in splash as well. Certain situations splash isn't a huge issue, just something to consider.