Fresh water dip asap. Here are instructions below.
Looks to be a combination of things, possibly flukes, ich or velvet.
Key Points to Conducting a Successful Fresh Water Dip:
Fresh water dips can be frightening for all parties involved the first time around. I steered away from them for many years because I was too scared to perform one. It's quite simple and is NOT as stressful as one would think, but it must be conducted properly.
Use a dark 1 gallon bucket.
Use RODI water that matches the same PH and temperature of the shipper water perimeters.
*Note: Retrieve water sample from bag the fish was shipped in and test the PH and temperature. Keep PH buffer on hand if you need to raise the PH of the RODI to match the water sample.
Add air-stone into the bucket to produce more oxygen and agitate the water surface.
Use Prime or Amquel to ensure ammonia doesn't rise in the bucket during fresh water dip (FWD)
The duration of the dip should last anywhere between 5-10 minutes.
*Note: This timeframe is dependent on the health and behavior of the fish during the dip.
Got him out the display. This is gunna be my first time treating a fish I don't even know where to start. I haven't done anything yet except catch him. On hand I have cupramine and herbtana.
Great! Cupramine is most likely the route you're gonna take as it attacks both velvet and ich.
You'll need to setup your QT asap. You can leave him in the water too long as ammonia will build and temp will decline. Unless thats a tank acclimation box, cant tell by the photo.
You need to conduct the FWD as instructed previously but he needs a place to go after... so that were this QT comes in