Aquarium salt is used only at the time of treatment of diseases

How to Use Aquarium Salt: An Aquarium Salt Treatment GuideComplete Goldfish Care
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And that’s it! You have successfully given proper treatment of a mild case of betta fish fin rot to your betta. However, the hardest part, and only thing left to do, is be patient and let the aquarium salt work.
But in our experience salt does more than reduce the inflammation and pain. In many cases aquarium salt is an essential part of the treatment.
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What follows is just an example of treating a mild case of betta fish fin rot with aquarium salt. Please understand this as just an example, and that it is assumed that the example betta is already in it’s quarantine tank. Be sure to read the labeling of your aquarium salt thoroughly before administering treatment to your own betta fish. Anything else might endanger your aquatic friends – and that’s the opposite of what you want an aquarium salt treatment to do.
Photo provided by Flickr•Treatment: HITH can be treated conservatively with Aquarium salt. Add 1 tsp/gal Aquarium Salt 3 times, 12 hours apart so that you end up with 3
Photo provided by FlickrAquarium Salt is a very important part of the Recommended Treatment that we strongly recommend
Photo provided by Flickr
Before choosing to add salt to your aquarium, you need to take into consideration the other living things in your tank which may not be able to tolerate salt such as many plants, smooth-skinned catfish, corydoras, loaches and invertibrates such as snails. This is another reason you should have a quarantine/hospital tank available for treatment of new or sick fish.Don’t worry if this all sounds confusing. We’ll walk through it, step by step.

First, we’ll compare different methods on how to use aquarium salt. Then we’ll determine the aquarium salt treatment that’s right for your tank.In this article we'll start bylooking at why aquarists use salt so readily, even though it isn'talways an appropriate treatment or additive. We'll then look atwhen salt is an appropriate treatment and how much to use. We'llthen round off this article with a look at the risks associated withusing salt, and why regularly adding salt to a freshwater aquarium orpond isn't necessary.When you’re dealing with parasites, you’ll want salt concentrations to be slightly higher than your routine salt treatments. The higher concentration makes the aquarium salt treatment more effective.An aquarium salt treatment can also be used regularly to reduce goldfish stress and stimulate slime coat production. Plus, salt can kill off parasites harmful to goldfish, nipping one problem in the bud!Slime disease is caused by a variety of parasitic protozoans such as () spp. that cause the skin to produce unusually large quantities of mucous. Salt needs to be used in two ways to treat slime disease. Firstly, the salinity of the aquarium needs to be raised to about 3-5 g/l, and the aquarium left this way for 7-14 days. Secondly, on the first day of treatment, the infected fish should be dipped into a strongly saline solution containing 20-35 g/l. This will help clear up the mucous and speed up recovery, but such salty dips are very stressful for most freshwater fish. While dips of up to 20 minutes should be safe in most cases, if the fish shows signs of severe stress, such as rolling onto its back, it should be immediately returned to the aquarium.