Right got some akvarium salt today and added it straight out of the box after doing a water change ( i realise now its not the way to go ) anyway i added about 12 tea spoons salt for my 175 g which atm only my silver arowana is living in, he got abit damaged fin but other then that its fine , should i change the water or do something . i know i should have cheked up earlier how to do but anyways this is how i did it the arow is looking calmer atleast.