Firstly, thanks to both of you for getting in touch so quickly! Heather, I was previously using a ceramic heater on a thermostat clamped about 8 inches from the top of the terrarium to keep the temperatures very similar to your recommendations, but I was told by my local exotics store this was too high, and that too low is worse than too high? Can you give me any more information on the temperatures, and reasons behind your recommendations? All the care sheet available on the internet say different things!
As for the supplements, I use the exo terra calcium with D3 and the exo terra multivitamin, and have just checked the dates on them, and both don't expire until 2014. I haven't tried switching brands no, do you think this might help? I keep other frogs (in separate terrariums) which are also dusted with these supplements and have had no problems of this kind with any of them. There have been no strange movements at all, other than slightly more mobility in the bone I am worried about, but like I said, everything else seems very normal. All the plants I sourced from a provider who (claims) not to use any fertilisers and advocates that all their plants are suitable for use with amphibians. Nonetheless, before putting them in with my frogs, I removed all the soil that they came in, and thoroughly rinsed the roots and leaves before replanting them in my terrarium. Besides, all the plants that are in there currently have been in there for many months.
Hope this answers your questions!
Carlos, I'll answer yours in a separate post in a moment, so that there isn't confusion!
Thanks again!