Well my method is rather simple. First of all, i put the water bowl over a part of the heat source. Then, I put books on each side of the screen and is only a strip of screen is left uncovered. I cover the uncovered part with a paper towl and mist it.
It may sound like a stupid, ineffective way of doing it but trust me i works. As a matter of fact it works too well. The current humidity level is at 95%. Now i actually need to lower it.
I understand that they will not survive without enough humidity, and a glass tank with a screen top isnt the easiest way to provide enough. However my methods seem to work so far, but trust me i do not plan to keep him in this enclosure. Its just temporary until i finish building his new one.
Beautiful black throat! and yes,im hopeing my nile can be somewhat like you blackthroat