I agree with everyone about checking temps and other parameters. It could also be that they need some more room to stretch out - 1/2 of a 40g seems small to me, esp for the 2year old. A little more floor space would give a larger gradient, even if temps are within the "safe" range, more of a gradient might be what they are looking for. Also could be hormones...
No cage is too large - nature is the best template - a snoot can't be booped too much
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