Hey everyone. I recently switched from dark black diamond blasting sand to light pool filter sand and all of my fish look washed out except the jack Dempsey, Cuban, and Severum. The Cuban and Severum were expected to keep almost all their color but the jack Dempsey gained alot. The rest of the fish in the tank look washed out such as my geophagus, Texas, salvini, sort of my convict. Is there anything I can do to make those guys regain most of their color without switching the substrate again?