I dont have any holes in my tubs and my humidity was on the low end for me. I just got some new additions and a couple of them had dented eyes so i needed to spray my bedding in the tubs a little to raise the humidity. Then again im way north and its already pretty dry here.

Im considering getting a large humidifyer for my home in the winter. Its just too hard to keep it at a good level.

Your humidity levels are good. I wouldnt start worrying about it unless it gets above that for an extended period of time.

I made the mistake of switching my pastel male to a tank and the combo of low humidity and having a hard time keeping temps right, he got a RI. Its better to have slightly higher humidity than to have it too low.