Welcome to the forum. Mantellas are great frogs. Until recently, I kept 8 mantella betsileo and 4 mantella baroni. A Victorian apothecary viv is an excellent idea. I have actually been searching for a nice sized, authentic jar for months that was decently priced. They bring in big bucks. You may be able to find a replica, but even then, they are not cheap by any means.
Enjoy the frogs. And for what it's worth, 90% of mantellas sold in the hobby are WC. The only company I know of that actively breeds them is understory. If you didn't get them from UE, it's just something to think about.
If there are numerous males, they will all call. Normally, males will climb high in the enclosure and protect their territory. Females will generally stay at ground level, although mine did climb from time to time.





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