My fish haven't been happy the last week... fuzzy spots ,cloudy eyes... params were ok, so I thought it was just bacterial from the stress of adding a new large fish to the tank... this morning I woke up to 4 dead fish, and everyone else hiding... corals all look great... nitrates trites and phos are all up, which I'd expect from the dead fish... I'll do a 20% water change as soon as the water is up to temp, and another tomorrow... anything else I should do? I'm afraid this is going to turn into a full on crash... my first disaster in 2 years...