There isn't an easy answer to this question. The pictures are not clear enough to diagnose plus with out seeing the fishes behavior it is tough as well. I will assume that your water is in correct condition (you have tested it - right?). The aforementioned water change with a different brand of salt should not have caused a problem if done as instructed. Raises a good question though, if all was ok with instant ocean, why change brands of salt?
Anyway...
My first though is because you let the sump get low and a significant amount of tiny air bubbles were pumped into the aquarium, this may have caused air embolisms in your fish. This can cause the eyes to protrude from a fishes head and may give the eyes a hazy appearance. it can give the fish a puffy or bloated appearance, and It also can put tiny little bubbles in the skin that may appear to be little dots often mistaken for parasites. If that's all it is, there is no need to medicate or treat the fish, give it time.
Pop eye is not a legitimate disease, it is a symptom of another problem. Medications claimed to treat pop eye are bogus, there are multiple situations that can cause the eyes to protrude, no 1 medication can address them all and it is not uncommon that nothing needs to be done to correct this condition other than let the fish heal itself.
First thing to do is identify if your fish have parasites or not. If they have little white -ish spots on them (not bubbles) then they probably have a parasite. (what is often incorrectly identify as ich) The irratation from parasites attached to the eyes can, and often does cause the eye to protrude and look hazy. If this is the case, vitamin and garlic supplemented food may help solve the problem. I caution putting to much faith in this method though, it may or may not fix the issue. If it were that easy we would not need medications and quarantine aquariums.
The next parasite concern would be flukes / trematodes. Since I am assuming that you didn't quarantine your fish before putting them into your aquarium, this is a very real possibility. This is not an easy to identify parasite and is not an easy one to deal with. This is a very selective parasite that doesn't prey on all fish. Tangs of the acanthus genus are notorious for carrying this parasite and easily could have it. The cloudy, protruding eyes is a symptom on this parasite as well as the edges of the fins having a "chewed up" appearance. Where the fishes pectoral fin meets the body (the fishes arm pit for lack of better description) is a place where trematodes often will congregate in large numbers so watch that area as well. If this were my fish, I would fresh water dip the pyroferis and see if any trematodes come off it. They will look like tiny white scales coming off the fishes body. Garlic, vitimins and even copper treatment will not fix this problem if it is what they have. Your salifin is not a common carrier of this parasite but is susceptible to it and your hawk fish is very vulnerable to this problem. It'll need to be addressed in a quarentine system and you'll need to not have fish in the display aquarium for at least a month (longer would be better).
Hope this give you some ideas to try and solve what's going on.
Joel
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