I would say not to worry. One of my crabs was particularly pale after having to molt in iso, but gained some color back after a couple of days.
The nutrition guide lists foods that contain astaxanthin and beta carotene, which can be used to boost color.
HCADirectors wrote:Astaxanthin
Definition - a strong pigment molecule that is usually found in rich red foods.
Function - enhances color in land hermit crab's exoskeleton and aids in keeping organ systems and bodily functions healthy.
Foods - krill, plankton, red seaweeds, shrimp
Beta Carotene
Definition - an orange and red pigment molecule that is found in brightly-colored foods.
Function - enhances red and orange color in hermit crab's exoskeleton and is processed into Vitamin A in a hermit crab's body
Foods - apricots, bell pepper (red, orange, and yellow), blueberry, broccoli, cantaloupe, carrot, chard, cilantro (raw), collard greens, dandelion greens (raw), lettuce (dark), mango, microalgaes, papaya, parsley (raw), passionfruit, peaches, peas, persimmon, pineapple, pumpkin, snap beans (raw), spinach, spirulina, squash, seaweeds, sweet potato
I also learned from another user that burning bush leaves help increase color, mine seem to have become more purple after eating them.
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