I've heard fish can appear a bit 'faded' and lose color when things such as ammonia, nitrite, etc. are present in the water column - but would this discoloration of the fish be permanent or is this only temporary? I've never experienced fish losing color due to stress or imperfect water quality, but I was reading a bit on this and was curious. Do fish we receive, such as ones shipped to you and not necessarily in the greatest water during that time, have permanent damage done to their color potential? Or is this simply something short term, and when the water chemistry issue is resolved, would go back to their full potential?