I was soaking my red foot and cleaned its shell and noticed this on the bottom of his shell. I’m not sure if it’s a fungal infection but if it is what should I do I was reading about giving it betadine, anti fungal cream, and chlorhexidine and anti fungal wipes. I don’t know which are good and if they are all good to use does the brand matter or does it matter where I get it from?thanks for the help!