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That is interesting. I’ve been taking photos every few days and it started small then got bigger. This heater I’m using is a good quality design specifically for tropical fish so I doubt it is that or the elision would have slowly healed, surely. However if it is that, then he should recover.

Thanks, yes I was wondering about that. Sort of difficult. Keep too few, or risk having more disappear. This chap is probably my 6th betta over the years. I’ve decided from here on in they are going to be solitary, but I’ve still got the issue of what to do with the tetras. I do have another...

Thanks, it has developed into a lump which seems sort of pitted. He’s been behaving normally throughout, so maybe it is just a lump. It does look odd though. I’ll look into columnaris, as suggested by previous response. I think my 30ltr tank is big enough. There are two big photos at the end, I...

It is a 30ltr tank which I believe is large enough for a betta. Am I mistaken? I’ve been changing about 30% weekly My test strips don’t show ammonia so I Haven’t been monitoring it. I’ll do a big water change once this treatment period is over.

Thanks, I’ll look into that one. I did have 6 tetras at the start, but one by one they disappeared. I’ve been meaning to get more, but until I am sure that there isn’t something horribly wrong I’ve been holding off. I want to leave it until I’m sure the betta is OK

I am getting desperate as my beautiful, friendly Betta seems to be deteriorating despite what I do. He has some sort of white with swelling. (larger photos below) Tank: 30ltr Biorb (I think that is about 8 US gallons) with one betta and two tetras, only plastic ornaments and standard Biorb...