u/Advanced-Strain2772

I recently upgraded tank sizes and thought i did an appropriate transfer but it seems like he scraped himself on some decor but Im unsure on how to treat this, i lowered his tank temperature but I unfortunately can’t tub him since i have cats and have no where safe for him, can anyone help??😭😭😭
And to make this clear he was never originally mine im trying to rehab him as my grandparents were neglecting him