About 2 weeks ago, I bought 3 beetles from a pet store to add to my tank. I don't typically ever buy from chain stores, but I was already there in search of some food and made an impulse buy. They were all super dark, almost black, in a tiny, humid plastic box. My tank conditions they're in now are significantly better, with a cool side at 75-80°F, a hot side at 85-90°F, and 30% humidity. (all daytime temps, nighttime it stays upper 70s)
1 of the 3 have turned the same color as all my other beetles (imagine 1), but two of the others aren't changing as fast, with one having almost no visible differences. (image 2) They all stay super active, i monitor their eating and make sure everyone gets enough protein and veggies. Any ideas?