I bought some German Blue Rams online about two weeks ago. They seem very healthy and active. They're eating and are not behaving abnormally at all. However, they seem to be lacking color. They're still fairly small, but they're almost totally grey minus the fluorescent blue dots and black spots. My pH is around 6.6 and my temp is 81 degrees Fahrenheit. I feed them brine shrimp and bloodworms with occasional flakes. Will they eventually color up or is something wrong?