A few months ago I bought an almost fully grown adult Male Salvini. He was rather dark but thought it was stress due to the fact that he was a trade in and then I grabbed him a few days later. He never really did color up and always remained kind of dark. I know male's aren't suppose to be all that colorful but he was severely lacking even after a few weeks in his new home. I then started to read around and found that Sals with dark substrate tend to be darker in coloration - well I have black sand. I figured I'd just keep him and live with it. That's until he beat up my female GT he wanted to spawn with so he had to go.
Male pic below

Now, here is a little girl I picked up about two weeks ago - same diet that I was feeding the male. I decided to take a chance and pickup another Sal (but this time to get a female since the majority of my tank is female).

So, what I learned is that it's not necessarily the color of your substrate that would cause a Sal to darken up so bad but it could be a few other factors. The large male I had I don't know what he was fed throughout the coarse of his life, which poor food could be a cause and also genetics. Of course I don't know the parents of the current Sal I have either.


Male pic below

Now, here is a little girl I picked up about two weeks ago - same diet that I was feeding the male. I decided to take a chance and pickup another Sal (but this time to get a female since the majority of my tank is female).

So, what I learned is that it's not necessarily the color of your substrate that would cause a Sal to darken up so bad but it could be a few other factors. The large male I had I don't know what he was fed throughout the coarse of his life, which poor food could be a cause and also genetics. Of course I don't know the parents of the current Sal I have either.

