Hi litefoot, thank you for your reply. Thinking back, he had brownish loose (extra) stinky stool earlier this week, and then until the last three days, his stool is white and really loose with quite a bit of undigested food particles. He has eaten only very little last couple of days and seemed like the food pooped out in at best 9 hours was hardly digested. Today he seems hungry (he went to the food spot at the tank and asked) but when I gave him food, he took it then spit it out after maybe chewing on it for half a second. Checked his mouth and throat, doesn't seem like there is a sign of mouth/throat infection. The vet appointment is next Wednesday, should I try to give him some fluid food meanwhile? What should I give him? Thank you again.
I don't think there was anything from the tank he swallowed. He walks around the house sometimes, but given RES don't eat when they are outside of water, I doubt he swallowed anything.
Care & Love giver of 2 RES's since 2007: Turbo and Trouble
RIP Turtle the Turtle from my childhood. I hope you have endless supply of cheese-flavor turtle food in the turtle heaven. I miss you.