Nice. Must be pretty are to see one tig traded in, not to mention two. I've never seen one in 8 years of hunting trade-ins.
What size are they (I realize you only got one) and how much did the store want?
Some are easy to get to eat what you want and some are not. Appears 50-50 and IDK the reason. I used to think it is dead versus live foods but then became not so convinced. One thing I became convinced of is that after the traumatic experience of re-homing is the best time to start offering the diet you want... usually.