Last Updated on December 18, 2021 by cmoarz
If I have to medicate my aquarium while at the same time I have other healthy fish in the tank with the sick fish, Will melafix hurt healthy fish, or is melafix safe for healthy fish?
This is a question I hear quite often from experienced and inexperienced aquarium hobbyists.
It’s not a small question, and it deserves a thorough answer.
The short answer is that, in most cases, Melafix will not hurt healthy fish. If anything – it will help keep them healthy as long as you follow the directions on the bottle for the size aquarium you have.
However, That doesn’t mean you should just use it when you don’t need it.
Prolonged use or unnecessary use of any aquarium medications can cause problems and complications.
Continued use of Melafix can also lead to the development of resistances that may make it more difficult to treat your fish in the future, so it’s important to only use it when you really need it.
With that said…
Let me start by saying I think Melafix is a great anti-bacterial treatment when used correctly, and in the right situations.
I have used it many times in my own aquariums with great success. My healthy fish were unaffected just like I would expect, while the sick fish were able to benefit greatly from the treatment.
In all cases I’ve used it, I’ve gotten the results I expected to get. As far as aquarium medications go, melafix is very mild.
That said, I would always recommend doing your own research before using any medications in your tank – even those that are considered to be mild.
There are a few situations where Melafix could potentially hurt healthy fish.
For example, if you have a very large or very small aquarium and you administer too much Melafix at once, it could potentially harm the healthy fish in your tank.
Labyrinth fish often have a hard time with melafix as well because of the way it coats the surface of the water with a film.
Beta fish for example are much better served with the alternative called betafix. It’s basically the same thing but had much less active ingredient while still remaining effective.
So with those exemptions aside, is melafix safe for healthy fish? For the most part yes. Just be sure to research the specific fish you have in your aquarium first before medicating like you would with anything you intend on adding to your tank.
Owner of AquariumGravel.com and also owner of actual Aquarium Gravel believe it or not! ;). Setting up beautiful aquarium sceneries and habitats since I was very young. Enjoy!
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