Cypress mulch might help - pretty hard to get round me, but I'm told it holds humidity pretty well. Covering part of the screen top on that tank would help as well - glass tanks with screen tops and UTH / heatlamps can get pretty dry.

I'd also consider adding a humid hide - an enclosed hide with a damp moss substrate where they can go pre-shed.

(And if they're all in one or just a few tanks together . . . consider separate housing.)

~Bruce

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