One of my fire sals feeds like a pig (Clyde), but Bonnie on the other hand hasn't eaten in two weeks. :\
I have tried crickets and mealworms and am going to get some more feeders soon.
Although I don't think food is the case. I think that Bonnie has some sort of deformation. Near her leg her abdomen goes inward, which I didn't notice when I purchased. ()
I will get pics later, but for now every single piece of advice is welcome.
I've just started keeping Fire Salamanders again - had a couple of females for thirteen years (full grown when I bought them so not sure what their age was). I find smaller, soft bodied slugs are a real favourite - but you must be 100% sure you get them from an area where slug pellets have not been used. Earthworms are also good.
Vinny
A good variety of soft bodied arthropods is an excellent diet for fires i.e earthworms, caterpillars, slugs and also woodlice. I give mine the odd cricket as well but generally only at the slightly cooler times of year.