Melleri, especially females and juveniles need a source of PREformed A.
Repashy LoD once a week, plain calcium 2-3 times a week, and repashy vitamins with Preformed A twice per month is a good start. There are a few Repashy products that fit the bill, so be mindful if you choose one with D3.
I also like Minerall Calcium Indoor and outdoor formula. I don't recall if their vitamin product contains Preformed A or not. Use the Minerall Indoor every other week, not once per week.
I liked a product called Dendrocare for dart frogs, as a weekly supplement for melleri and other sensitive species. It supplies a lower dose of vitamins and can be used more often, but I still recommend a secondary source of Preformed A.
In all, I would not supplement more than 3-4 days per week, keep the dusting light and don't turn the feeders white with dust, hydrate, hydrate, hydrate, and revert to plain calcium and reassess your vitamin dosing frequency, if swelling around the throat occurs.
Not to take away from
@jpowell86 and his well regarded knowledge of the species, but, 10 years ago, I bred a CB female in captivity and hatched a clutch, as well as had 3 other clutches result from captive mating of WC melleri, in my care.
@jpowell86 and I are dear friends and there is no rivalry for title of melleri expert, but either of us is quite capable of offering sound advice regarding melleri keeping.