Ich or something else? ID and Treatment Advice needed

[cchase231]

I added a Sargassum Trigger two weeks ago and he was not welcomed by my tangs. To tone down the aggression i put a mirror on the tank wall and within a day it subsided (occasional tail whaps here and there, but nothing to serious). A few days ago I noticed the trigger had what looked like skin abrasions and some fin fraying, I assumed they were from the tangs. Then yesterday I noticed a single white pimple on the PBT and the trigger having a few white blotchy patches. Today the tang has more white spots/dots, but they don't look like the typical ich pictures I googled so I am unsure if maybe it is a different parasite. I have a 55gal I could use as a qt, but catching all these fish and shoving them in a 55 might be unrealistic. I guess step one is identifying it and step two is coming up with a battle plan. Here is the pertinent info:

Tank:158 5x2x2 25gal sump
Nitrate: <5 salifert
Fish: PB Tang, Yellow Tang, Sargassum Trigger, Coral Rabbitfish, Melanarus wrasse, Red Velvet Wrasse, Orchid Dottyback, Occy pair

1. How old is this aquarium?
4 years
2. If less than six months old, what is ammonia level?
0
3. What is SG of this aquarium? How measured?
1.023/refracto
4. When was the last fish added to this aquarium?
2 weeks ago
5. Was it quarantined? If so, how? And how long? Was it prophylactically treated? How?
no
6. If you are using a copper based medication, which one? How often do you measure level? When?
haven't got there yet
7. If you are using hyposalinity, how did you calibrate your refractometer?
not hypo, but pinpoint solution recently bought
8. Please describe in detail, the appearance of the fish? If there is one or more pimples, are they lumpy? What color?
see pics
9. Please describe the behavior of the fish as best you can. Is it acting reclusive? Is it always up towards the top of the aquarium? Is it avoiding light? How active is the fish?
PBT: a little more hyper than normal, scratching, slighlty rapid breathing
Trigger: normal
10. Is the fish eating? What?
both eating aggressively
spectrum A+, garlic soaked seaweed as of today, freezedried plankton soaked in vitamins and garlic, soaked mysis

 

[ThRoewer]

The white you see is the fish's reaction to the parasite and not the parasite itself (it's actually quite tiny). For this reason ich can and likely will look a bit different on different fish or even on the same fish depending on its health condition.

You will know if it is really ich if the spots go away in a couple of days and then come back a few more days later.

 

[cchase231]

well I suppose I'll keep a close eye on it over the next few days see how it goes. I am tempted to just pull the fish and stick them in a qt, but I am affraid the effort of catching them and sticking them all in a 1/3 the space may be counter productive. Even if I do qt getting the dottyback out may be impossible, he lives in a mammoth rock and hardly leaves it.

 

[ThRoewer]

Dottybacks can usually be caught with a trap. Either put food in it or a mirror and he will go in.