Unfortunately, there may not be many if any true experts with this Pleco. It all may be conjecture as they are available at larger sizes in general. I would be interested in experimenting with a few phase 1 with water parameters and food and watching if and when they change color.I have wondered the same. Hopefully, we'll get some experienced opinions.
Wes at Rarefish is my vendor.Lovely pictures. Who's the vendor of the Lut?
Well aware that no one really knows. I've read all the literature available on them and the most common hypothesis is that it's purely an aging phenomenon but believe that there is more to it.I don't think anyone knows for sure. Probably just some educated guesses and personal experience