I have had my fish for 4 weeks now and over the last couple of days i have lost 3 fish 2 tetras and a molly. On close inspection one of the tetras had white spot. No other fish Seem to have it touch wood. looking on various forums seeing its the weekend pets stores are closed. I see one way to help the fish is to put the temp up and to add some salt and do a water change. This i have done I think i have made a mistake i used common table salt 1 tsp per gallon. The fish seem ok they are feeding and swimming around. What should i do about the salt will i have to do a complete water change. i have also replaced the filter. The tank was left empty for 4 weeks before the fish were introduced. I have also been adding weekly cleaner natural micro organisms to degrade the ammonia and nitrate.