I have had my barbs with angel fish ever since I got them (I know people say you should not keep them together but mine had been fine for months) but when I moved all my fish into the new 71/84 gallon tank, which came with fish including 2 adult angels, my barbs have been terrorising the big black one.
I have now moved the barbs into my 16/19 tank where they will live with my corys and I have moved the glass cats, platys and x-ray silver tipped tetra into my biggest tank. So, the barbs won't be able to hassle anyone! My black angel fish's fins are looking a bit nipped and white along the wounds.

What shoud I use to help them considering the other fish I have in the tank. I have lots of medicine at my disposal and the parameters are fine.
Thanks.