Tropical fish meds. I used to have several saltwater tanks, loved them!
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Ah! Too complex for me, saltwater, with all the chemistry involved! I just have a little five gallon freshwater tank with a half-dozen neons and three albino coreys. Once we know for sure they're not going to throw the Daughter out of the country I plan to get a larger tank, and do an epic planting of it (to mimic an Amazon streambed) and get the little guys some more friends to live there in a proper little swarm of neon.
Have a problem with a couple of the neons having got mouthrot, and there is nothing available here to treat it other than a mild antibacterial/antifungal combination of water additives. Most annoying. I was talking with a fish expert on a forum and got the pompous "overuse of antibiotics" speech. I am extremely aware of anti-biotic overuse, etc., but that is what is needed to deal with Flexibacter Columnaris or Flavobacterium Columnare.
So I treated the poor little things for a couple of months with the OTC stuff, no luck. It didn't get worse, but it didn't get better. Then some of them started showing what I think was a fungal infection on a fin or two, so I upped the temperature of the tank a few degrees and added Tetra Medica Fungistop. Five days and a water change later and the fin fungus is totally gone, but the mouthrot is still there.
Earlier on I had netted the two with obvious signs, and applied dilute hydrogen peroxide (via a fine-tip paintbrush) directly to the lesion, and then methelyne blue, and then gave them a 10 minute swim in Betta Revive (that I'd brought with me) as that was the only thing available. They were not happy campers, but the mouthrot seemed a bit better for a while, and now it's back to what it was again. So I'm pretty sure it's not fungal, but one of the bacteria. So annoying to not be able to treat it for them! As of this morning I've got five neons that are still swimming and acting normally (although at least two have the mouthrot), and one has been hanging out inside the hollow log at the bottom of the tank for a few days (not a good sign).
I wonder if aquarium antibiotics are availble in the EU? If so, when we go for the Christmas market we will have to stock up.