I have the following fish in the tank:
6 Praecox Rainbows
3 Panda Corys
2 Rabauti Corys
1 Rubbernose Pleco
3 Platys
The Rainbows, Pleco, and Platys are all showing signs of Ich. I had 6 Panda Corys, but have now lost 3 of them over the past 1.5 weeks. Here are some pics showing the spots:
Here is the Rainbow Platy...you can just make out the white spots running along the top of the fish from his nose to his dorsal fin:

Here is the Red Tux Platy, you can see the spots a little better on him:




Here are pics of the Rubbernose Pleco:




I've got the water temp up to 82F and I'm slowly taking it up higher. How high can I safely take the temp with the Pleco, and the Corys? Also, can I add any aquarium salt with the Corys and Pleco? If so, how much is safe to treat the Ich? Any help is appreciated.