While Viewing the animals is important, I feel mostly The well-being for animals should be better. The question I would ask, would you rather have a large exhibit for a tarantula with natural rubble? Or the exhibit that looks like the opening in a public Gas station that looks like you can slide your Leftover sandwich in the small exhibit. Another way for tarantulas to be put on public view is already done. The keepers can take the Tarantulas out of the exhibit and show them to the public as a sort of ambassador. Lets not forget that multiple arachnids are endangered such as Gooty sapphire tarantulas, which I think would be pretty interesting to the public. Same with Tarantulas in general. Weather guests may find them disgusting or not is irrelevant, its still eye-catching to the visitors regardless. I would actually say some people were really engaged in the Cincinnati zoos award-winning insect house, and in other insect exhibits. And as jarne said, Inverts are actually easier to keep than fish, Salamanders, and others.