At the GPASI(local fish club) fish auction I bought 3 red fin compressiceps and 6 julidochromis dickfeldi. I had a couple question about these fish. 1 if they can go into the same tank and 2 what substrate sould I put in their tank. I know it sould be a sandy substrate, I just don't know if the sand sould be dark or light to bring out there best colors.