I would say yes. The calcium is not properly absorbed without it and a good portion of the calcium will pass through the stomach/GI tract unused. The amount in the mvi is likely less than they need. You would have to check the dosing to know for sure.

Here is a discussion we had a short while back that you may find useful.
http://www.frogforum.net/tree-frogs/...ut-vit-d3.html