You may want to intertain this, It really does not matter what anybody tells you or if they are captive hatched or not. All that is totally meaningless. What is important is, what is happening to your animals, as a girl once told me, Here and now. Here being your place.
Croc monitors are very hardy, wild caughts rarely die, they need to be murdered. You must keep that in mind.
Back to yours, a sign of not feeding is a sign that something is wrong. Feeding and not growing is a sign that something is wrong. Realize this, a healthy croc monitor will feed on top your head, and eat your head.
Now you have a problem, first thing to do is to find out what the problem is. You have read all the crap on here, why are you asking people here? do you expect them to say something different then what has been said one million times?
But you have to start somewhere, that place is at a vets, find out if its sick or has a parasite infestation. Only a vet can tell you that, we cannot. They have an advantage, not counting all the years of training and tests and stuff. But they have tools and the actual animal in question. Yes, thats huge advantage.
It does not matter if you have a ten gallon tank or larger, as long as it provides what they need. I start my baby crocs and baby lacies in ten gallon aquaria. While some may frown, I hatched them and they will grow like weeds and mature into healthy adults. That is proven. So, why would I care what they say? That applys to what people say to you. You have to do what works for you. So start learning by going to a vet. Get a clean bill of health, then you can ask more about conditions. If they were healthy, then most likely, you would not need to ask questions, other then, how do you get them unattached from my arm. F