Don't know what's happening... got a new 33G auarium with 6 guppies, 3 swordfish, 2 mollies,2 barbs and a catfish. 4 mollies, 5 guppies and 1 catfish died 1 by 1 within last couple of weeks. I tested the water, it's fine. Seems like the fish is scratching itself, some get white spots and enlarged red gills right before they die. I put some copperSafe in the tank and increased the temperature to about 27C to kill off the sickness (i think it's Ich) and i wonder if throwing some salt wouldn't hurt as well. If copper and salt can be combined, how mush salt do I need? Is there anyhting else that I can do now?

Thank you :)

I answered this question in the other section where you posted it as well.