my male and female RES

Question
hello my question for you is i have a male and female, female about 3half inches long and male about 3"long. we had the male at first he was very neglected only like an inch of water no light in a 5.5 gal tank. he did not have enough calcium . we have brought him back to good health. now after him having his own tank for a while we introduced a friend. before that he was normal he would eat bask and be normal. at first when we put her in he did his claw flutter tried to mate with her but not sure if they actually did when we were at work or not. when he did his flutter she would sink to the bottom and close her eyes and stay put and he would swim away. now she is normal eating basking etc. hell eat and swim around like crazy we had a big baskig spot at least 5 turtles there size could fit on there. she does her normal bask he wont even go near it i havent seen him bask for two days. when u walk in the room he freaks and swims crazyly across the glass and hides. he used to be friendly people turtle but now i dont know what to think why is he acting like this hes still eating jus seems restless and wont eat

Answer
Hi Bryer,

If your RES are only 3-3.5" long, they aren't mature yet, so it's unlikely they would be breeding.  It's possible that your "female" is actually an immature male, since juvenile RES all look female until they mature.  

It's possible your other RES is bullying the male.  That's often the problem when a turtle is hiding, not basking, etc., assuming there are no obvious symptoms of illness.  Often you won't see anything going on, but one turtle will be acting much the way yours is.  You didn't say how large your tank is, but for two RES that size it should really be at least 60 gallons.  Having a big enough tank, along with plenty of hiding/basking areas (you said the basking area is large, so that's good) may help.  You may also want to feed him in a separate tank so he gets enough to eat.  

Just to be sure, check your temperatures to make sure the water isn't too warm.  If there isn't enough difference between water/basking (10-15 degrees), they may stay in the water too much.  Also watch him for symptoms of respiratory illness, especially swimming lopsided/tilted.  That may require a trip to the vet.