Is it Crypto (Marine ich) or Lymphocystis

I have had my Saltwater tank up and running for about 10 months. After 2 months of cycling I added the first fish. I didnt quarantine these fish. I was new to marine fish and didnt know any better. One of the had ich and it killed both of them. I bought some reef safe ich treatment and followed the directions on it. Then we decided to buy more fish. Again they got ich (except 2 percula clownfish) even after 4 weeks of quarantine, within days of being put in the display tank. So then I read everything availiable about marine ick. I removed the 2 percula clownfish which did not show any signs of ich and qaurantine them with copper for 6 weeks and then 2 weeks with no copper for a total of 8 weeks. The tank only had a cleaner shrimp, horshoe crab and a turbo snail. Nothing was added during this 8 weeks to try and finally kill off the marine ich. About 9 weeks ago i placed the 2 clownfish back in the display tank. After being in the display tank for 2 weeks they looked fine, so I bought a black and white Heniochus. When I bought it, it had Lymphocystis (the lfs store told me what it was and they had had the fish for about a week and it was eating fine. They told me it was a virus and it would disappear after a week or so). They were big white cottony looking spot on its dorsal fin. After the trouble with ich, I now have a permenant qaurantine tank. I brought the fish home and after a week in the qt it had no Lymphocystis visible. I left the fish in the quarantine tank for another 6 weeks. The fish was looking healthy no white spots and active and eating well. I moved it to the display tank about 4 days ago. Now there are some white spots showing up on the dorsal fine again. I have read that Lymphocystis can reappear on a fish especially after moving it because of the stress. Is this true or could it some how be ich again. My water parameters are as follows, ph 8.3 - 8.4, sg 1.024, no nitrites, no ammonia, nitrate 40ppm( I know it is a little high), Alkalinity about 3 meq/l. It is a FOWLR tank 40 gallons. I will try to get a picture of the fish tonight a little hard the guy is fast. Any advice would be appreciated. Thanks!

 

The other fish you speak of... it wasn't lympho if it went away in a week.

I'm guessing you're dealing wih Ich.

My seahorses had it for a couple of years. After a 3 month hypo it disappeared (I was not primarily treating them for lympho, it was a side bonus).

 

It is Ich

I had to move all my fish back to qt. Hopefully After another 8 weeks in the qt my dt will be good to go. I am medicating the fish now. From now on I am going to treat every fish for ich. Hopefully I can finally get rid of this once and for all. Thnaks for the reply.