The dwarfs commonly never surpass 5 inches, where as the giant can reach 7-10 inches. It's hard to get some of them to eat off the tongs: try brushing the food along his mouth with the tongs. If he or she is still reluctant, move on and let him or her eat on their own. You can always keep trying and eventually they should accept it. That's cool your an experienced arachnid keeper; the only thing I used to watch relating to arachnids was a guy on youtube named "tarantulaguy1976". Frogforum is great for people new to this hobby and many dedicated knowledgable people here to help you.