Ridiculously stupid question, and the last one I'll ask, I swear.
My baby RES has been opening his mouth while swimming under water lately. It's something I've never noticed before, although I may just not have had a good opportunity to notice it before. He doesn't open it above water, he's swimming great (in fact I woke up to him exploring his new sand substrate, what a cute surprise~!), he basks, he eats RAVENOUSLY (you'd think his shell were hollow!), he's perfectly fine in all regards, he just.....opens his mouth under water.
I notice it the most when I'm sitting by his tank. He'll swim up to the glass and stare at me and open his mouth over and over again. Is he drinking? Is he begging? What's he doing?


