Does anyone know the advantages of using 'freshwater aquarium salt'

May 15, 2016 - Using aquarium salt should be considered if you like to keep your betta healthy
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People add aquarium salt on a regular basis because they know it helps with disease and figure that using it regularly will help prevent the fish getting sick by giving it more protection because of the increased slime coat. The fallacy of this logic is that the slime coat is encouraged because the salt stresses the fish out. As stated above, for short periods, this is not a problem. Over longer periods, though, the increased stress begins to compromise the immune system of the fish and, as time goes on, makes it more susceptible to disease, therefore backfiring and making the use of salt cause the very thing it was intended to prevent.
I would say the majority of opinions is for using aquarium salt
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First off, some definitions. When we speak of "salt", this is a confusing term, because salts are a large heterogeneous group that consists of any ionically bound elements or compounds. The salt that most freshwater aquarists mean to speak of, however, is NaCl (sodium chloride). THIS SHOULD NOT BE CONFUSED WITH MARINE SALT, WHICH CONTAINS BUFFERS THAT ARE VERY HARMFUL TO MANY FRESHWATER FISH. Table salt is basically also NaCl, only with iodine added (the myth that iodized salt is harmful fish is largely false... iodine is a natural element that is needed in the diet of all fish, and is actually a supplement in many fish foods... the only thing in table salt of real harm to FW fish are the decaking agents, which are very low in concentration). Turn Filter Off When Using Aquarium Salt? | My Aquarium Club
Photo provided by FlickrTo Salt or Not to Salt?, using salt in a freshwater aquarium
Photo provided by FlickrFor some illnesses, we recommend using both aquarium salt and medication
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To treat a betta with fin rot using aquarium salt, transfer the fish, a heater and some hiding places like real/fake plants to a separate or tub with treated tap water of the same temperature as the water in the aquarium (be sure to give the fish some time to acclimate to the 100% tap water)! Set the heater to a temperature of around 77-78 F – any higher will make the rot progress more quickly, and any lower and it might be harmful to the fish.You may have been advised by the staff at the pet store that it's standard practice to add salt to a freshwater tank. This is not necessarily so. If you are going to add salt to your tank, make sure you are using the right salt and doing it for the right reasons. Don't use marine salt; use aquarium, kosher or canning salt. Table salt usually contains iodine, which the fish needs but gets from the fish food. Any more iodine than that and it becomes a detriment. Salt should be used during times of stress to the fish, such as during an outbreak of a disease. But it should not necessarily be added to your tank just as a matter of routine care. The amount of salt you add to the tank is dependent upon your reason for doing so.Electrolytes are essential for the uptake of oxygen and the release of carbon dioxide and ammonia through the gills. A lack of electrolytes may cause serious health problems. API® AQUARIUM SALT, made from evaporated sea water, provides these essential electrolytes. AQUARIUM SALT does not evaporate, and is not filtered out, so it should only be added with each water change. Care should be taken when using salt with live plants, as some plants may be sensitive. Unfortunately, I’m not familiar with raising catfish as I’ve never had catfish in any of my aquariums. However, after doing a bit of research, I found that some people recommend using half the regular dose of aquarium salt for these type of fish. Maybe you can try that – or less if it makes you nervous.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.Some aquarists may prefer to avoid the metric system, but unfortunately there isn’t a neat conversion between parts per thousand and ounces per gallon. There are however approximately 4 liters per US gallon and 28 grams per ounce, so if the required dosage is 5 ppt, that’s 5 grams per liter, and therefore 4 x 5 = 20 grams per US gallon, and that in turn works out as 20/28 = 0.7 ounces per US gallon.
One level teaspoon of salt contains weighs about 6 grams or 0.2 ounces, so it is possible, with care, to measure out salt using teaspoons. However, once a box of salt is opened it absorbs moisture from the air making this approach unreliable unless the box of salt is stored in a dry, airtight container between uses.