Thanks, yeah, I'd love to change the substrate....i worry about upsetting the delicate balance of the tank that I finally got restabilized by switching out all of the substrate....maybe one day though. I did add the black in, so i like it at least a little better now than when it was all blue and purple :-P Perhaps I'll take out half of what's in there and add more black (which i have on hand anyway) and slowly weed out the blue and purple that way. Of course that means pulling out all the plants and re-planting.....so maybe i'll wait until i'm sick of how the plants look and want to rearrange them
I've added the tank specs in an edit to the original post