Interesting stuff! Like I said the vitamin supplementation thing will be totally new to me, as the animals I've kept previously do just fine without it. Actually I spend almost nothing on their food as the newts eat worms from a worm bin which costs at most $5 per year to keep with occasional frozen bloodworms as a treat...fish get prepared food, worms, BBS, and daphnia/mozzies from outside or cultures. So the idea of sustaining the life of a critter with some powdered stuff is kinda funny to me. I'm betting all the reptile keepers who do this and UV light(now that is even weirder) prolly think I am crazy though. I bet baby newts which I sometimes have problems with would benefit from the supplements though.
Btw rattler any experience with Mantella baroni? Now that is one colorful mantella. I've seen a few imports at $25.