Hello all

about a month ago i got a red ear slider female 4in. i checked her over making sure she was in good health before adopting her. today i woke up and fed her normally like everyday and today she poked her head out of the water so i gave her a small treat as a "well done!". I noticed after a hour this clumpy yellow-ish substance in the water and i became aware that it wasn't what her poop was looking like so far. I was wondering (since this is my first turtle and i want her healthy and happy as can be) what to do with these symptoms. or if its just her way of still slowly getting use to her new home.
-the yellowish mysterious stuff
-her top shell is starting to turn a greenish-brown color with what looks like red "painted" on look. (but shes a red ear slider so unless shes a hybrid..)
-isnt basking very much (i dont see her at all but every few days ill notice some of the substrate in the water. I have a Zoo Med Aquatic Turtle Tub Kit. Water and basking temperatures are were they need to be as well)
-doesnt really swim more of crawls back and forth.
Thank you all for ANY advice. Im a new pet "parent" and i want to make sure she's ok before running around scared spending money on a vet
