Feeding and Nutrition :: 3 RES NOT eating... what 2 do?

[SilverLovesRaph]

I own 5 RES but last week the smallest one stopped eating. A few days later the second smallest stopped eating and now the middle sized one is hardly eating a thing. Fourth one I'm getting worried about... I tried everything! Pellets, cucumber, celery, carrots, lettuce, tuna, chicken (only a bit 4 chicken) but they wont eat a thing! Tuna was only eaten by the largest (who's double in size) and the second largest (fourth smallest) would only eat it hand fed... I'm trying everything in the fringe and cans but nothing! They haven't climbed the wall for the past month either... I don't know what to do! Help?!

[vear]

Can you tell us about your setup? Tank size, basking area etc. What is the water and basking area temperatures? What size are your RES?