There seems to be some type of white growth on the bottom of Franks shell. He is about 4 inches now and in a 75 gal tank with over 200 gal of filtration power including a basking dock with proper lighting. So I'm pretty sure the habitat is not the problem.
Theres a picture below.
Can this be fixed with an otc med like repti turtle sulfa dip?
Also wondering what this is, it seems to have spread a little bit.
im not real sure what that is. i dont think that the repti sulfa dip would take care of it though. it almost looks like the shell rubbed up on something rough? and i think your he might be a she.
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1.0.0 Red Ear Slider-Cujo
0.2.0 part Boston Terrier part Pugs-Hershey and Lilly
I don't think a sulfa dip will help. I would prepare an area to dry-dock your turtle and make sure your turtle can bask as much as he can. It's much harder to deal with fungus if the infection worsens or returns. You'll probably want to get a prescription for silver sulfadiazine from your vet.
About the vet, Make sure before you go that your vet know what he or she is doing when it comes to turtles. Many of us have been to vets that did not have clue about turtles.
I would hold off on changing him at this time, until you take him to the vet... however if you choose to change him it would not hurt .
Please excuse any spelling and/or grammatical errors. I'm dyslexic.I do my best!
I'd search the forum for SpotsMama and fungus. She has very clear details about a situation she had to deal with, it should give you a good idea of what may be involved.
One thing I've learned since that experience with Spot's shell is that a somewhat different condition - what's commonly called shell rot - often looks similar (though not exactly the same) to what Spot had, which was fungus. However, in the photo your turtle's case looks exactly like Spot's so I expect the same treatment would work.