Just my personal opinion, I wouldnt remove one from the tank...It's more stress on the frog than it's worth. You can make sure food is getting to both frogs by hand/tweezer/turkey baster feeding them....removing one of them from the tank would be a total last resort for me. Again, this is only my opinion, but I don't like the idea of stressing the frog once a week by removing it from it's home when I think there are better ways to make sure it gets fed. Also, if you get a chance to talk to one of our other members here, Mel20_20, she is almost an encyclopedia of dwarf frog info....or you could look at some of the old threads she has written in about them by searching some of her older posts. 
