I would like to see if the API salt is a 100% seasalt or if it is mixed with kosher salt.
If it is mixed what percent is the mix of seasalt.
I was in the Aquarium fish business since the 60s. Export,Import,Wholesale,Retail, Saltwater,Freshwater Tropicalfish. Reptiles and Amphibians. Now retired.
I will tell you what I have learned about salt and my take on it.
The controversy over salt has been going on since the hobby was first developed.
I don't think it will ever be settled!
First freshwater fish don't drink water they absorb through there skin.
Saltwater fish drink water.
Most aquarium fish do not like salt and some are not salt tolerant at all.
The same with plants.
If you add salt to your tank, the fish have no say because you control there aquarium.
A lot of Tetras,Catfish,and Scaleless fish like knives and loaches are salt intolerant.
Most of your fish that have live young are salt tolerant and some rely need it.
Most aquarium salt on the market is useless has no value at all. Its Kosher salt.
Salt that has value in some cases are salt for marine aquariums. Like instant Ocean.
I have seen the most delicate of saltwater fish swimming in pure fresh spring and mountain water such as morish idols and butterflies happily grazing on fresh water algae.
I have also caught Oscars,mollies,platys swords,and guppies in pure ocean water.
Most freshwater parasites ,fungus,and bacteria die in saltwater.
The salt level has to be high and prolonged.
The same is true with saltwater fish going into fresh water.
They are removing there parasites.
I have my molly breeding tank at 75% seawater and I have a few sword tails in there.
My morality rate is about 1 fish in 6 months. Breeding rate fantastic,no baby mortality.
Fresh water fish converted to salt (drink saltwater).
Salt (marine salt) should only be used on live baring fish.
Mollies,swords,guppies and platys are prone to shimmy.
This is usualy due to metabolic imbalance.
This is when sea salt is needed to restore the fishes balance.
Mostly the electrolites and any other trace elements the fish may need.
Seasalt should be used along with other meds targeting a specific disease.
Like ick,fungus or bacterial infections and other parasites like flukes and worms.
It gives a helping hand to the meds and promotes healing.
Salt should only be used in a QT tank bare bottom recommended in QT.
So for me salt has no place in the community or show tank.
Especialy useless salt like kosher or reg. aquarium salt with no proven value.
Salt should be used only as a medicine for specific treatment.
Or along with another med.
Used correctly it has its benefits for some fish. And will save some fishes lives.
It should be used as a medicine.
I use a lot of salt and am still experimenting with it on my own fish.
My only problem is finding a sick fish.