My water conditions aren't the best, yet, my fishes are doing their best so far. I want to put a fungus and fin rot remedy in the fish tank but none of them have it (at least I don't think so). Two-three fishes each have a tumor/lump. One-two fish have a dark red area on their gills and two fishes has a swimming bladder disorder (one is permanent). I have 6 fishes in total.

Here are my water conditions:

pH - 6.6-7 Nitrate - 200+ppm (may be due to poor filter) Nitrite - 0-.5ppm Hardness - 300+ppm Chlorine - 0 ppm Alkalinity - 0-40ppm

Thank you

  • I'm not sure to understand why you want to medicate a tank when fishes are not sick ?
    – Manuki
    Mar 25, 2019 at 15:22

1 Answer 1


It's safe in a controlled environment; when you use medication in your aquarium you need to control the parameters and use these methods:

  • Change 40 % of the tank's water volume, once a week
  • Put activated carbon in the filter to remove the surplus medication from the water

BUT FIRST try to not use medication; look for alternative methods, for example:

  • Termoteraphy
  • Aloe vera
  • Alimentation change (green peas)
  • please explain how this is done and add some sources where i can learn more about your suggested treatments. Mar 25, 2019 at 7:23

Not the answer you're looking for? Browse other questions tagged or ask your own question.