Not sure of the type of acrylic or if this would apply. But acrylic will absorb water and swell. Some acrylic needs to be kept wet to maintain strength. I am not sure if the acrylic of a tank would or could become brittle if it's too dry. If you live in a humid area you're probably fine. If the humidity is low where you are at you may want to wrap the tank in something to keep it from drying out. Again, I have no idea if this would apply to acrylic tanks (even though I have a couple), I'm just going by experience with other types of plastics that need to be kept conditioned.