Thankfully it looks like he is recovering now. I have been feeding more often than usual for the past couple of days. The UV
sterilizer will also be installed by tomorrow and hopefully this will help to control whatever it is if it tries to strike again.
I'll also try what you have recommended.. i'm already feeding him the whole range of new era flakes and liposome sprays which i believe contain immuno-stimulants but since i've only had him a few days it will take a few months to kick in. Do you by any chance feed nori to yours? If so do you buy from supermarket?