Yes, the two adults that I have now were bought at 1" each out of the same tank and have always lived in the same tank together. One changes its belly color frequently and the other one never has, not once. Which I find fascinating, because it suggest that the puffer it's self has no control over the color change. That would mean water conditions, mood, lighting, diet, etc. plays very little or no part at all in the color changes. So what could be the cause? I have often wondered if it could be a difference between sexes? Of course the only way to find out would be a successful mating or a dissection, which of course is not going to happen. A few other thoughts I have about GSP coloring habits are 1)could this be a variation of the same species from two different locations? 2)could this in fact be two different species? 3)could it be a gene defect/difference of some sort? Unfortunately no has answers to these questions. It just goes to show that there is still a lot to be learned about the GSP.
Does anybody else have thoughts on this?
