White Spots... Help needed!

[icehot1000]

Dear all, my tomato clown and squirrel fish had developed whitish spots on their bodies, faces and tails for about 2 weeks already. Please advise how to treat them and what causes these white spots? Are white spots life threatening to the fishes and do they spread to other fishes? I have another 4 chomis which seemed ok (ie, no whitish spots). Do I have to add some medication into the water? And where to get these medication and if possible, the names and costs.

Thanks a million!

[FuEl]

Improve water parameters, remove other forms of stress, and feed your fishes well. They should recover in no time.