My boyfriend doesn't want to cull them as some of them are "pets" or the "chewing isn't that bad of a problem yet, just wait". So for now I have to figure out something else for them to chew on.
Sadly once they know how to chew they never stop and the worse is that they will teach other (tub mate or offspring to do the same)....the is not solution aside from culling when it comes to chewer, same for biters.