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What are your water paramaters testing at both dispaly and qt tank
Ammonia
No2
No3
Ph
Ammonia
No2
No3
Ph
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Is your DT a FOWLER? If so we could talk about treating the DT with hyposalinity in the 15 ppm range and raising the temperature.
The other fish have already been exposed to ich. It sounds like it came in with the clownfish that wasn't quarantined before introduction to the DT. Once the trophonts rupture and the tomites enter the water column, it can take up to several weeks (depending on temperature or water chemistry) for new trophozoites to appear on other fish. It isn't clear how long the tang was in the PT but if it was more than a few days this scenario seems fairly likely.
Anecdotally, there are a number of different treatment methods for ich that have all been highly successful. Hyposalinity is an option, temperature modification is another, as is copper. What is important to remember is that treatment if ich doesn't really involve treatment of the trophozoites visible on the fish since the fish's immune system actually encapsulates the trophozoite in an attempt to combat the attack. Ich treatment is really only effective once those white spots rupture and release the tomites into the water column. Current belief is that those tomites have approximately 48 hours to attach to a new host before dying in the water column, and while they are free swimming they are quite susceptible to UV sterilization (provided proper wattage and dwell time for protozoans) and copper treatment.
The first question is is the tang eating? Will it eat nori and/or meaty foods? If so, it is PROBABLY healthy enough for further treatment. I would treat with cupramine. Begin with a first dose that raises the copper level to .25 ppm. If the fish is still eating well 24 hours later, I would administer a second dose to bring the concentration to .5 ppm. Maintain at this level constantly unless the fish stops eating. If he does storp, wait 24 hours and if still not eating, do some partial water changes to bring the copper level down until he starts eating. However, the concentration must remain at the therapeutic level for 30 days to ensure full eradication. Keep in mind that cupramine can and probbaly will cause some amount of liver damage to the fish, but if this fish is otherwise heathy and eating well it should survive and recover quite well.
Things to keep in mind: Cupramine is ionic copper so use a test kit designed for cupramine such as the Salifert kit. If you use a chelated copper make sure you use a test kit designed for total copper such as the API kit and dose according to the instructions.
You also need to remember that you have a DT that has been exposed to the parasite now as well and will need to do something to treat all those fish.

Check for ammonia. Get an ammonia badge for the tank this will help being as there is no lr to help with bacteria break down. Keep lights dim to help with stress, get new saltwater and keep up on wc's. In a hosp tank should not have any lr so you can treat with cupramine if it does that rock will absorb any copper based meds and can't be used anywhere else. Also feed some medicated foods this will help and observe him and watch your dt could pop up there again
About FW dips: They are mostly useful for removing worms (ex. Flukes) and "surface parasites" from fish such as velvet & brook. Ich embeds deeply into a fish's skin (under the epithelium) so a FW dip will probably not dislodge ich trophonts. Whenever I do a FW dip, I use RODI that I aerate beforehand (using either a small powerhead or an air stone), and also temp match the water (using a small heater) to the water the fish is coming from. I don't even worry about the pH, as fish aren’t overly pH sensitive for short durations like this. After the water has been properly oxygenated and temp matched, remove the air stone & heater and FW dip your fish for no longer than 5 mins.
If you happen to have a "clean" FW aquarium, using that water to FW dip your SW fish is ideal. Provided the temp of that water matches your SW tank; but the water should already be oxygenated.
what would you recommend to go about curing the ich?? I don't think i'm going to do any more fw dips, it only stressed him out way more than he needed to be
Since you stated you were afraid to use copper, TTM might be the way to go for you: https://www.reef2reef.com/threads/tank-transfer-method.192655/
But if you need to QT more than 2 or 3 fish, I would use copper in a larger QT: https://www.reef2reef.com/threads/copper-treatment.193343/
Doing water changes won't help with the parasites, but will help to improve water quality. If you are worried about copper treatment, look for either Coppersafe or Copper Power (and an API copper test kit). I am starting to believe those brands of chelated copper are actually safer to use than ionic copper i.e. Cupramine.@td3025 No worries, we all have to learn about Marine Ich sometime.Doing water changes won't help with the parasites, but will help to improve water quality. If you are worried about copper treatment, look for either Coppersafe or Copper Power (and an API copper test kit). I am starting to believe those brands of chelated copper are actually safer to use than ionic copper i.e. Cupramine.
thank you!
