The only way to reduce the chimera (the fake iguana in the glass) is to light the room sufficiently brighter than the inside of the habitat, whether it be a 30 gallon tank for a baby, or a giant one for adults. But I don't know how to quantify that.
I guess, since I have time now, and glass panels, and a large workshop, I want to make experiments with lights on both sides of glass, and come up with an orderly set of numbers in watts, lumens, etc. that a person can easily follow, and be able to plan a habitat that does not have reflections, or at least does not have bright reflections.
Doing that will show whether this is actually a solution to the problem. I hope I can borrow a white light meter.
Also, it seems that prescription eye-glassed can be coated with a non-glare outer surface, so that your friend do not see the room's reflection in your face.
I've looked into it, and as of then there were no films or coatings that cancelled glare. Only one treatment eliminated glare, but the pane had to be pressed up against a picture or printing. Farther away and there was no see-through for the piece, just fuzz. I figure it must have been developed for protecting fine-art paintings.