What is this?

[67chevellemalibu2]

It’s only on my Blue Hippo Tang which I have had for a week tomorrow. He didn’t have it when I brought it home.
None of my other fish have it on them .
No I did not quarantine him or any other of the fish I have.
He swims all around the tank and eats fine.
Is this Ich? If so, is there a chemical I can add to my tank besides copper?

 

[EmdeReef]

Any chance to take a better pic? Would help if you describe what it looks like.

If it’s ich, nothing reef-safe will eradicate it. If you don’t want to set up a treatment tank, look up Humblefish’s article on ich management which is sometimes possible. Good luck

https://www.reef2reef.com/threads/ich-eradication-vs-ich-management.188775/

 

[67chevellemalibu2]

It’s a few white specks and a white patch on its underbelly.
Yeah it’s hard to take a good pic through the glass.
It’s a fish only tank.

 

[biophilia]

Do you have any inverts in the tank? If you're sure it's marine ich (Cryptocaryon irritans) and if only fish are in the system, a relatively safe way to eradicate it from the system is hyposalinity. Just slowly (over the course of 3-7 days) lower the SG to 1.009-1.010 and keep that way for 6-8 weeks, then (_very_ slowly!) raise the SG back up to normal over the course of a full two weeks (SG increase is much harder on fish than decrease). If you have inverts, they can be isolated in a small additional tank during this time (at regular SG) and the marine ich lifecycle should be broken.

** Note: hypo-saline conditions won't effectively treat marine velvet so for this method to be work you'd have to first insure the fish have ich.

 

[lagatbezan]

A better pic or maybe a video will make it easier to diagnose what the actual spots are. It could be ich like mentioned by others or even velvet and you might be seeing the early stages of it since hippo tangs are usually one of the first fish to show symptoms due to their thin slime coat.
The white patch on its belly could be from it wedging itself against the rocks when it sleeps at night. They are notorious for that as well.

 

[biophilia]

In the meantime, working to increase the slime coat on your fish will help prevent free-floating ich trophants from attaching. API Stress Coat will make your skimmer go nuts if you have one, but there is some literature to support its efficacy in increasing slime coat production (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5591633/). There's also some anecdotal evidence that feeding your fish fatty foods (like blood worms) can increase slime production.

 

[4FordFamily]

Looks like ich and velvet potentially — the first pic looks like it has a dusting or several very small dots on it. Is it swimming in to powerheads? Hiding from light? Breathing heavily?

The treatment either way is to remove all fish, treat them in copper for 30 days, then run the tank fallow for 76 days.

If it’s velvet you’ll want to get that done yesterday.