Okay. I am not sure if your question has been answered to your satisfaction yet, but I thought I would try to lend a hand. Your geckos seem to still be quite young, and your patternless is a tiny little thing. I would not suggest removing the hides, not even to feed them. If they are nervous, taking their only refuge out will stress them even more. As I believe you stated. Have you tried taking the mealies out of the bowl, and putting them onto to papertowel? Sometimes little ones can be quite picky about the way they eat. Or sometimes they don't know there is food in the bowl. The mealies usually move more if they are out of the bowl. My geckos have given me a scare, by not eating before. I know how worried your can get. Eventually though hunger has always won out. If there is nothing phisically wrong with your geckos, they will eat eventually. I would suggest you take the little one out of the tank though, even if you don't see any aggresive behavior from the other two there can still be bullying going on. I have always had Boo and Popeye in the same cage together, and I never really had any problem. However, I have had my patternless in his tank alone since I got him. He is twice the size that Boo and Popeye were at his age. I believe it has alot to do with the fact that he had no compitition. Well, I hope this help you out some. Good Luck 
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7 Leos
Milo(my male) Mongo, Raptor,and Spaz
Popeye and Boo(named after Monster's Inc. Character)
and Pumpkin the Patternless
1 dog
Baby (Peekapoo)
1 Cat
Mr. Kitty
1 Hedgehog
Chronic