Drake, I understand where you are coming from completely about the way you've been talked to. It is totally inappropriate and, it's true, that that kind of behavior will never be honored or even tolerated in any kind of professional relationship.
I want you to know that I have no bias in what I say and don't want to gang-up on you or anything. But, I also need you to know that I completely disagree with your set-up plan.
If you say something like "Of COURSE people have had problems mixing SOME species, this is why you carefully research prior to doing a community setup, to make sure you are not putting in anything incompatible," then it doesn't make sense that your research includes only taking the advice from the people you agree with. You're only paying attention to what you want to hear, from what it seems. Plenty of people here are telling you otherwise, the specific problems, and there's even a personal account to someone who's lost another reptile to a fire-bellied toad here. There's a reason they're fire-bellied, and they really shouldn't be mixed with other species. I mean, I keep an open mind about these things, and I agree that mixing CAN SOMETIMES be okay if you know all the specifics and get species from the same area, but I wouldn't attempt it yet and your animals come from all over the world. And these people know a lot more than I do and they see it differently. They're not just experienced in herps, either, they're experienced in keeping, raising, and breeding herps, specifically amphibians.
Listen, that is NO reason for anyone to get rude with you. But some people just get emotional when they see a disaster coming and you shouldn't take it personally. Look beyond the way they same something, disregard the few personal attacks, and actually read what some of these people, some actually very polite, are trying to tell you. I've read in at least five books about people who mixed fire-bellied toads and fire-bellied salamanders together, only to find out they're not the same species, duh, and the sals died. Please, understand that everyone's priority here is along the lines of making sure these animals don't die. That is animal cruelty to us, whether it's intended or not, because some of those animals should NEVER be mixed.
When your anole grows, and even your RETF, it's highly likely that they're going to eat the dart frog. Realize that these animals try to eat anything that fits into their mouths, and even some things that don't. In just having my two smallest GTFs next to my largest squirrel, the GTFs attacked the squirrel. They never even touched him, because he saw them coming, but he was 3/4 of their length and girth at the time. The would, by no means, be able to be a meal for them, because he simply would never fit down their throat, and they were all very well fed. That's just their nature.
Anyway, I will not jeopardize the future of these animals by deciding to stoop low and strike out at you, and I wouldn't want to disrespect anyone like that anyway. But, please, reconsider the species you are mixing, and if you MUST mix, select something different.
Also, a 49-gallon isn't at all big enough for all of these animals. You could put a few RETFs in there, a lot of dart frogs, OR some fire-bellied toads. But, please, don't mix those species. And I don't even think that anoles belong in tanks. They're an arboreal species that probably need more air circulation than a frog, even if the frog is also arboreal. And don't dart frogs usually need reasonably cool temps? The opposite of the anoles and RETFs? Please, think about all this, and let me know what you are going to do. I'm worried for the animals, I don't want to upset you. Thanks for reading this if you have, and if someone has told you that mixing these things is alright, I'd love to talk to them and ask them why they'd say it's okay. It's obviously not, but, again, I'm always open for a good discussion. You can always learn from anything.