If you really wish to showcase these precious amphibians , you should consider a small exhibit away from your herp building.The objective would be that visitors would view the mantellas while in the open air (the visitors , not the mantellas).You would be absolutely amazed at the different attitude that visitors have to herps if they can view them without needing to enter a herp building.Visitors subconsciously feel the need to keep moving when they are in a regular reptile house.It probably comes down to an unwillingness to monopolize the view of an exhibit , and give other visitors a chance.Plus the fact that in a regular herp building there is generally vivarium after vivarium and after about the first five , the majority of visitors are beginning to pay less and less attention , and begin moving faster.If you have a special exhibit for these creatures , that in itself gives them a particular significance , and visitors will stop before the exhibit in the open air , and devote minutes , rather than seconds to the mantellas.Obviously, some kind of sliding panel would be drawn across the viewing panel in the evening to prevent heat fluctuations at night.And here´s a neat little trick - have lots of signs pointing to the "mantellas" , never to the "mantella frogs". 99.99% of visitors won´t have a clue what a "mantella" is , their curiosity will be provoked , and they will make a priority visit to this exhibit.Trust me , I have seen this trick work time after time.Best of luck with the exhibit , and further down the road , please provide a report with photos.