No, I don't think I did.
I wasn't primarily talking about doing what is barely adequate vs doing what is best*. I was talking about the distinction between two ways of approaching animal care.
(1) Making a list of things a person wants to do re: keeping an animal -- keeping it in a viv they already have in the closet, putting a plastic skull decoration in the viv, feeding it pinky mice for the thrill of the chase, keeping it with another species, and so on. Then, "researching" to figure out if any of these things will harm the animal, excluding all those things that will, and going ahead with the rest.
(2) Choosing a species to keep, and then figuring out the needs of the animal (temps, lighting, viv size, viv design) and meeting those needs the best one is able to.
On (1), cohabbing can slip into the mix -- it can pass the 'won't obviously kill my animal' test. On (2), the issue of cohabbing never comes up, since there is no need of captive frogs that is well served by adding another species to the viv.
* Though I suppose this is relevant. Is it
best to have an MG in with frogs, or
best not to? Not to, of course, since it avoids territorial issues, food competition, pathogen transfer. There's no reason why it would be best (or even better) to have any other animal -- especially a non-sympatric one that exploits the same habitat and food resources -- in with the frogs. It doesn't
improve anything for the frogs.
On your main question, since you asked: get rid of the RH meter. They're misleading. Add water ("mist" but more like 'rain', like a rainforest) heavily once daily, enough water so that some makes its way into the drainage layer. Adjust ventilation (downward, in your case) so that there is enough that the surfaces in the viv get pretty much dried off in a few hours after misting, at which point you can mist again (though perhaps not so heavily; the full soak is only necessary once a day, preferably in the morning).
If the frogs behave normally, and the plants do well, then the watering routine is working. If not, use the behavior of the frogs (they tend to hide when too dry) and that of the plants (more complicated, but rot means too wet and crispy means too dry) to adjust things. If the RH is too low is some spot in the viv, the frogs will go somewhere it is adequate, and so long as the viv is getting at least one good rainstorm a day they'll have (a) plenty of water to drink, and (b) plenty of little spots to hang out until it rains again.
On 'read online': nearly all (95%) of webpages that come up searching 'dart frog care' or similar are simply not worth reading. Amazon Affiliate sites -- which are trying to sell things, not convey accurate, up to date and experience-based recommendations -- have proliferated to the point where a general web search simply isn't useful anymore. Nearly all these sites have been written by someone who has not kept the animal in question, and has cut and pasted from other similar sites. Even the more "respected" of these sorts of sites have these same issues. Big online sellers of animals and supplies also have motives (to sell product, but also less obvious ones such as (a) keeping things simple enough for nearly everyone to understand ("lowest common denominator"), and (b) maintaining their overall public appeal -- telling someone 'no, you shouldn't do that' is one of the best ways to alienate them) over and above conveying accurate and detailed information.
All this is intended to be helpful and friendly -- use what you like, and leave the rest on the shelf for someone else to use.
