How does one improve the coloration of the mantle? My T.Maximus has lost a lot of coloration in its mantle...it appears healthy in that it's not gaping, it reacts to light/shadows and it has a good extension on it and has grown, but the colors that were once very bright blue/black/purple now have faded and appear rather dullish greyish purple- with only bright colors at the very edges of the mantle.
My water paramaters are nearly perfect...what might cause it to lose color over the many months and is there anything I can do to bring those colors back?
Thanks!