red earred slider turtle

Question
I bought 3 red earred slider turtles, I guess about 5 years ago..Two of the turtles are about 6 inches in size and one is a good 12 inches....Why the size differents?

Answer
Hello Jackie,
It is possible that the larger of the 3 has taken over domination and would require removing him from the area to allow the others fair feeding. If he or she has established a pecking order so to speak, then the others will not be allowed to feed as they should./

Can you tell me about hte set up you have?