03-22-2011, 11:28 AM
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They are both definitely Bolivian Rams. I cannot ascertain if male or female. It is difficult to distinguish sex with this species until they are mature, and I've no idea how old these may be. Usually after 1.5 years it is fairly easy to see extensions to the caudal fin (male) and sometimes dorsal rays.
These fish will "change" colour intensity quite frequently, that is not in itself a problem, it is natural. I have a male that is now 2.5 years old (they live 4 years) and he can be pale too. When the female was present, he would really change according to his mood, but on his own he is generally less colourful. But it varies.
I am not knowledgeable enough to comment on the ill fish from that photo. Sometimes this is easier when one can observe the fish continually. If for instance these are actually both males, one is going to be dominant (or try to be) and if the other submits, it will always be paler and less active, and depending upon the environment (space, hiding spots) and the fish itself, may slowly or more quickly die. As noted in our profile, this is a species that appears to live in isolation in nature, only coming together to spawn. The continual presence of another fish is therefore not likely to be met with acceptance.