my incubator is a small yellow chep dome one i was wondering about putting water in them on the 18th day and on to bring up the humidity. i hear everyone saying not to open the incubator from the 18th day on so i really dont know what to do. since the incubator is so small as soon as i add water the humidity and temperature go back up pretty quickly. so would that make it not a problem if i open it to add some water in there? thanxs