Is your humidifier in the tent? If not, get a filter for your intake... itll help against a lot more than that:
https://www.amazon.com/Phresh-Intake-Filter-140-CFM/dp/B007ZU6NGS
It's also a lot better keeping the humidifer outside of the tent for better humidity distribution if possible. Otherwise you may have 90% RH air being blow directly on one plant, or one part of a plant, etc.