Hi there! I came home after being away for two nights. I left with perfectly healthy fish and came back to my poor neon goby being covered in white lesion type marks? He seems irritated and keeps brushing against rock. Anyone know what’s wrong with him and how I can treat it please? I’m gutted I just want to make him better. My first thought was ich but I don’t want to treat my entire tank with the wrong medicine. Thank you!