72% is fine. Clean the tank thoroughly more often, do a complete substrate change and let your nose tell you if there are problems. A musty or any other gross scent tells you when you have to take action.

I notice you have another thread inquiring if you need a heat lamp. After reading both of these, I suggest getting a 50 watt red light lamp just in case you might need it in the future. You might not but better to have it and not need it. A heat lamp will reduce humidity but again, 72% is fine.