Sorry for the delayed response. I hope his fins are not degenerating more. He has fin rot, which is usually caused by poor water quality (although sometimes it is caused by a bacterial infection). I recommend changing the water weekly for such a small tank, and only about 10% or your beneficial bacteria will die off and cause the cycling process to start over, which is very stressful on a fish. Betta fix is ok, but I would recommend using Melafix if it hasn't cleared up in a week of a water change. I would always rather go natural with fish because they have open systems (unlike our closed systems) and they are very susceptible to things in their environment.

I definitely don't think you should move the betta to your tank with the rosy barbs. His fins will be gone because rosy barbs are semi-aggressive, and they are quite the fin nippers, and bettas are slow moving with long flowing fins (for males). Not a good combination. You said the barbs are new? Have you noticed any fin nipping from the barbs on your danios? The danios are peaceful/community fish and also shouldn't be with barbs, although there are cases where semi-agressive coexist with peaceful fish I definitely do not advise it.

Hope this helps.

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