Okay, Taco's water levels are about 2 inches lower than usual (just to give him a little room, too) and his tank is completely bare now. I added a small heater to heat up the water. If it's just constipation, perhaps it'll help pass the gunk in his body. Otherwise it'll hopefully make him more comfortable. Here's to hoping he pulls through the night.
Meanwhile, Tian-Tian is flaring at me. Maybe I did something wrong? :(
I'm just trying to do all that I can at this point. So frustrating that I don't seem to be making any progress.