Okay so ever since i moved my eight year old red eared slider into their new tank, which is an indoor pond and about 80 gallons, they've been a lot less active than usual. They just sit in one spot and they usually only come out to eat.
I'll list what's going on down below so it's easier to read:
He is eating normally
His water is clean
His water was about 86 degrees (which is a bit too warm and I will lower it soon)
He hasn't been using his basking dock
When I take them outside to walk around every week they are just as active as they've always been
If anyone has any suggestions or needs more information please reply.

