As I said few months ago, I will try grey gravels. Here it is. The grey gravels (marble) are from east coast Taiwan (according to the LFS). The bichirs really like the new substrate. They started cruising around without any purpose (almost all of them including those never cruise). Everytime, after I switch gravels, they get excited a while.
Don't ask me why there's a disparate weird fish among them.
Before I put in new substrate, I moved those chunks of wood and the black gravel, and keep the bare tank for 2 months. Their color did turn lighter as compared with the time they lived on black gravels:
She is really dark with black gravel (the same one on above photo).
She is the least active one in the tank, but, she is pretty active as others now:
She's happy
Even the big old brother is happily cruising.
Don't ask me why there's a disparate weird fish among them.
Before I put in new substrate, I moved those chunks of wood and the black gravel, and keep the bare tank for 2 months. Their color did turn lighter as compared with the time they lived on black gravels:
She is really dark with black gravel (the same one on above photo).
She is the least active one in the tank, but, she is pretty active as others now:
She's happy
Even the big old brother is happily cruising.



