This guy is still turning darker. It has caught up to the other Armatus in the tank and is still the aggressor of the two. Took a few more pics during feeding time so the black one is all fat which i like. I just want to see another picture of an Arm like mine. They color is just so dark.
Wow thats a great color. Mine Armatus is the lightest it can get, so its weird to see an almost pitch black Armatus. Your substrate may make a difference on its color.
Could be different regions, could be a subspecies. But I highly doubt it cause this is the first case, that I've seen atleast, but the tank itself looks really dark so I wouldn't doubt it adapting to that overtime. Reason for the other not doing it? Idk.
The tank is a bit dark and that's what I thought, but having the other one never turn dark makes me question. They have been in this tank, 250G, for about 7 months. The black sand has been in about 4 months. Before that they were in a 55G with white sand. I have had this pair for a little over a year now. The black one has always been a shade darker than the other one and more aggressive. Just weird color too me. You would think that these two were collected together but I guess you never really know, so different regions seem hard to me. I bought them at the same time and both were similar in size. I guess what ever caused it I'm glad I get to keep a unique one. Wonder if the color will last once its over 20" only about 14" or so now
All this armatus talk lately just about has me ready to get another one....but I must resist the urge.
It is certainly an interesting looking fish that I would like to have.I would go with it being a regional variant but if that were the case there should be more black ones seen in the hobby.