yes, I have two 40 gallon breeders with screen tops... tops are foiled with painters tape over the top.. about 95% covered... i thought about getting the clear plastic sheeting (thats like glass but not glass) instead... and just cutting it to fit each to hold humidity better... if I run a humidifier in the snakes closet i can get up a little (i have a small humidifier) i was also thinking of investing in a bigger humidifier that can run longer times...