Help Progressive : Tank wipe out

Just got a good look at the dottyback, in the right light it looks like he has been sprinkled in a fine white powder, its almost too small to see. This definitely looks like Oodinium if it is why didnt the Exodin I used two weeks ago kill it off. I thought Oodinium was a golden colour, this is white.
 
There are a variety of parasites--Oodinium usually does have a goldish sheen to it, and ich is typically looks a bit larger on the skin. But, without lab work, there's no way to get a definitive id. I'd try removing the fish to a quarantine setup and using a more aggressive treatment for at least 6 weeks. Any parasites remaining in the main tank should die without a host, and then the fish can be returned once healthy. Investing in a quarantine tank for any future purchases might pay off as well.
 
Latest update, no sign of the dottyback, the angel has visible white spots on pectral fins and the tail, he is darting around and flashing all the time. To be quite honest I have had enough of this, I think I am going to let naure take its course and abandon the tank.
 
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Finished the Myxazin course (whitespot), started an Exodin course (oodinium) I know this is risky but what the hell, I am getting desperate now. There is still no sign of the dottyback I supose I should go and try and find the body, but I have decided to give it another day. The angel fish has white spots all over his fins and tail but otherwise seems unaffected, all the remaining fish feeding and swimming normally. As usual the damsel and the wrasse show no sign of infection, I have read that fish can develop immunity to protozoan infections through multiple low level exposures. In these cases the cyst like reproductive stage does not occur because they either don't form or drop off the body of an imune fish, this would certainly tie in with what Iam seeing.
 
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Dottyback dead.
The angel is now covered in white spots these definitly look like Whitespot, he is swimming directly next to the outlet pipe from external filter.
I hope Myxazin actually works because it does seem to have done anything so far.
Continuing with Exodin treatment just in case there is Oodinium as well.
Wrasse and Damsel completely unaffected as usual.
 
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Latest if anyone is still interested.
All fish swimming and feeding ok, the angel seems more active, he still has spots all over his fins and some on the body but he is no longer spending all his time hanging in the path of the filter outlet.
 
That should be a good thing. Possible the fish will shake the parasite themselves, or at least get it down to a tolerable level. The hanging out in front of the outlet is probably related to trying to get more oxygen--parasites preferentialy colonize the gill tissue and can make it hard for the fish to breath.
 
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The Angel is looking a lot better the number of white spots is visibly less, all the fish swimming and eating normally. Its a shame about the dottyback it was a magnificent fish.
 
At last I am over the crisis the Flame Angel is much better and nearly all the white spots are gone, all fish swimming and eating normally.
I will wait a month before thinking about adding any more stock.
Anyone like to comment on the maximum stocking load for a 240 litre/ 56 gallon tank.
Current stock 1 pygmy Flame Angel, 1 Pygmy Rusty Angel, 1 Bananna Wrasse and 1 Blue Yellow Tailed Damsel.
 
Glad everything is clearing up!

In terms of adding fish...Maybe a hawk? Or some inverts--I'm partial to shrimp.
 
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