Superpig definitely does the job but I find it unnecessary. Why? Because Repashy Calcium+ (formerly known as Calcium+ICB) contains the same color enhancers but in lower amounts. They have pretty much the same effect, just slightly less pronounced (you should see my Matecho tinctorius).

Are you sure you'll need the springtails for the metamorphs? I have a feeling they will be able to take wingless Drosophila melanogaster since my juveniles are eating D. hydei fruit flies without issue. Here's a quote from Poison Frogs (2007) by Lötters, Jungfer, Henkel, and Schmidt:

As soon as the front legs appear, the tadpoles are placed in angled containers with a water level of not more than 1 cm that lead to a "terrestrial" part of some brown leaves. When the metamorphs have eventually left the water, they can be housed in small terraria of maybe 20 x 30 cm. Froglets are initially dark brown with an indistinct light striped pattern. Measuring between 9-11 mm in length, they are capable of managing Drosophila right away. Unfortunately, the offspring of wild-caught specimens with a lot of white in their pattern are usually much less attractive than their parents, as their light stripes are often much narrower. The reasons for this phenomenon are as yet unknown.