redearslider.com

My wife and I have had two female RES that we obtained from different places. They are about the same size, one of them must be older though because she has a bigger head and bigger hands. We thought they would get along so we bought a 125 gallon aquarium and build an ATBA and a sump for it. Last night I put them in together and they seemed alright, they took a couple of bites at each other but it seemed more out of curiosity than anything. I put them to bed last night and then checked on them this morning about the time their light turned on, and the smaller one Sid was chasing the slightly bigger one Korma around. I've separated them again but is there any way I can reintroduce them to each other?

We've kept them in separate tanks right next to each other for about 4 months before this so they would hopefully get used to seeing each other. I haven't fed them in the big tank so there is no feeding aggression and we planned on feeding them in one of the old tanks anyway. Does anyone have any suggestions besides splitting the tank? Should I just keep putting Korma in with Sid and monitor their activity? Could it be that they were just scared from being in a new place? Any answers would be much appreciated.

I would keep them separate and have monitored time together. Make sure there is plenty of room on the basking area and feed them separately. Hopefully that might work but RES are generally aggressive and permanent separation might be the only solution.

Agreed with Steve.

Unfortunately I have been through this, and separating or splitting the tank is the only answer when they start biting or chasing each other. :\