Hi, thanks for your advice which I followed. I fasted him, bought daphnia and gave him Kanaplex in case it was anything nasty. The bloat has not gone down at all (though after the last tank clean, there was a lot of poo including a white stringy line). He is not well at all, barely moving at the bottom, bloated but swims over to get food. I think I can try fasting again, or treat for an internal bacterial infection. People mention Epsom salts but I think opinion is divided. Feel like I am going to lose him, he came sick from the pet shop and was subject to my learning curves.
I keep finding white shells of mini snails that came in on a plant - I'm wondering if they are polluting the water somehow. Can't get rid of them but managed to keep the numbers down every tank clean.
can I get the advice of Colin_T and Byron also here please?