Experiment with it.....thats always fun! I just read about your gravel desicion. You are using flourite black and black sand as the main substrate right? Then you are going to have a black gravel river stream thing
. Are they different shades or is the work you put into it going to be worthless?
Also is this going to be a biotope or something down those lines. Maybe I missed it(doing homework and this at one time lol).