02-01-2010, 02:22 PM
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How long has this tank been set up? Its not a good idea to medicate a tank with an elevated ammonia reading, you may want to look into a quarantine tank at this point. I also would not want to expose healthy phantom tetras to the meds... they are quite sensitive to most medications.
For quarantine I would suggest a tank, heater, sponge filter (with air pump to run it), some decor to help minimize stress, and water from the main tank to get it started.
For the main tank I am going to suggest daily water changes of 10% to reduce the ammonia without harming the biological cycle.
In the future I would strongly suggest getting onto a regular maintenance routine of 30% water change once/wk, gravel vac once/month. Keeping the water quality clean and stable is vital for healthy fish. Letting it deteriorate until you show problems and then doing a water change to try to fix the problem, is only asking for more and continued problems. The constant up and down of water quality will cause many illness issues in any fish.
You will then have the option of medicating the sick fish in quarantine or moving the tetras to quarantine until treatment is complete... but I will tell you it is less expensive to medicate the sick fish in quarantine (you'll use less medication). As long as none of the other fish appear to be showing any symptoms, if you catch things quick enough, you may be able to beat it rather easily.
If you tell me how big your angels are I can suggest a proper size tank for quarantine use. If you wish to get just 1 tank that will last for the life of those fish to serve as quarantine, a 40 gallon breeder tank would be the smallest I would consider for adult angels. Healthy angels will grow quickly, so this also may save you some money in the long term (not having to buy a larger tank for quarantine later if its needed when those fish reach adult size).
I hope this helps... unfortunately there isn't much more to do until the water quality is cleaned up and we find a way to separate the sick fish from the phantoms for medicating. It is possible that with the improvement in water quality the fish may get better on its own, but it sounds like things have advanced pretty far already, so I have to say there is only a chance and it is more likely medication is going to be required.