PLEASE HELP!!!

I think my turtle has an eye infection. Last time this happened my red-eared slider eventualy died. For the past 2 days Tex has sat on his rock and slept. He’s been pooping a lot and the poop is really big. It ranges from a greyish to clear color. I cleaned the tank yesterday morning and when I checked it today there was mold growing on some of the poop. I dumped the water and put Tex in his feeding tank. As soon as he was set in the water he began scratching his eyes. I feed him Vitkraft reptile mix, but he only eats the shrimp. Well this morning when I put him in the feeding tank he only ate 1 shrimp peice. Usually he’ll eat 4 or 5 or however many I put in the tank. I’ve been doing everything I’ve been told to do to care for a hatchling and it just doesn’t seem to be working. I have a UVB light that rests 10 inches above the water. The water is 1.5 to 2 inches deep. I have a heat lamp and the water stays at around 75 degrees. I clean the water everyday. I use soft water from the sink. I bought a PH tester and PH adjuster liquid. I havn’t been using it lately thoug because I am so confused. I’ll adjust the water to neutral and then without putting the turtle back in it, later I’ll test it again and it will be back where it used to be. I feed Tex Reptomin pellets, Vitakraft and crickets. He doesn’t pay any attention to the crickets though. Does anyone have any idea what I’m doing wrong? Thanks! Candace