Ich or velvet?!

[mrhasan]

Well basically, till yesterday night, I have lost:

3 lined chormis
1 blue throat trigger
2 clowns (one false perce and another platinum)

The only fish that is doing alright (no sign of illness) is the red hawkfish.

What I thought to be ich seems like it might be something else. For example, my platinum was perfectly fine with no white spot and eating in the morning. When I got back home at night, it looked like it was dipped in flour. So densely packed with white spots, stopped eating and basically gone in the morning. I do notice "whitish particles" floating around in the water (not hydroids) and sticking on the glass, mostly at night. I am thinking it might be velvet. Or something else.

Any idea on what it might be? Water is in pristine condition and corals are doing well (knock on the wood).