Red crushed garnet or 3M Red quartz is by far the best for bringing out color and contrast in Bichirs.
True crushed garnet is also super heavy so doesn't get thrown around as much and doesn't get into filters.
I swear by 90% crushed garnet mixed with 10% black tahitian moon sand.
The red makes the contrast and patterns "pop" and the little black makes the greens come out.
It's a mix that Bichir enthusiasts here in Japan have always sworn upon.
Pale sand will always wash Bichirs out, and while SOME Ornates may not fade right out, they do take on a much paler color IMO.