I think yes a fish can adapt to different environments, but within reason, and certain fish do this better than others .... If you force a fish to live in an environment that is way out of its natural pH range or salinity range, or hardness range that fish is generally not going to do as well or grow as quickly, or be as healthy as a fish that lived in an environment similar to its natural habitat ... and I think this is the case with the Armatus along with diet .... to say otherwise, is like saying I'm going to force this great white shark to live in a freshwater tank ... although this is an extreme comparison, it is along those lines .... it is impossible and the shark will die! ... fish have evolved and adapted to live in their specific environment and to change too much is to put at risk the fishes health, bottom line
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I know what you mean but you are pointing the extreme. A little tap water won't do much harm. I do 50 % WC with cold water from the hose and there is chlorine in it. Before when i was paranoid, i did add prime and all that shenangans in the tank for my armatus. for some reason, I realized that my armatus didn't need all that luxury stuff to survive. I just ommit it from now on. I guess mine just acqumulized itself in this milder condition. Just my 2 cents.
