Fish disease question

[OKCorals]

I currently have one fish in my display tank, a sixline wrasse. He's been the only fish in there for over a month now. The tank is 6 months old. He is my 3rd sixline wrasse, and 4th fish overall. I think the other 3 fish I previously had in the tank died due to me being careless with water changes and the temperature dropping too much when I added new water. I have since purchased heaters for my saltwater mixing buckets so that should no longer be a problem. My question though is, if it wasn't the water changes that killed the fish, and was instead due to some fish disease, is there a disease that would be able to survive in the tank but maybe not kill the sixline wrasse that is currently in there? I plan to add two clownfish after my vacation that was supposed to happen in May, but now probably June (thanks coronavirus), and I will be QT'ing them, I just wanted to see if there was any chance they could succumb to a disease lingering in the DT.

Hopefully that wasn't confusing.

 

[Big G]

If the original wrasses had not been QT'd, and added to the tank, there is the possibility that the tank has parasites. Ich, velvet, brook, uronema are all possible. The current wrasse's immune system may be holding off the possible parasites. You could consider doing the "Black Molly" test to see if indeed there are parasites in the tank. But provisions should be made to house the molly after the test.

Black Molly Quarantine

** This information was originally posted here: https://humble.fish/community/index.php?threads/black-molly-quarantine.55/ ** Preface - Freshwater (FW) black mollies have been used for years in saltwater aquariums for algae control. However, this write-up will focus on their potential for...

www.reef2reef.com

 

[OKCorals]

If the original wrasses had not been QT'd, and added to the tank, there is the possibility that the tank has parasites. Ich, velvet, brook, uronema are all possible. The current wrasse's immune system may be holding off the possible parasites. You could consider doing the "Black Molly" test to see if indeed there are parasites in the tank. But provisions should be made to house the molly after the test.

Black Molly Quarantine

** This information was originally posted here: https://humble.fish/community/index.php?threads/black-molly-quarantine.55/ ** Preface - Freshwater (FW) black mollies have been used for years in saltwater aquariums for algae control. However, this write-up will focus on their potential for...

www.reef2reef.com

They were not QT'ed. When I purchased the wrasse, it was the first fish I had ever purchased, and was told by one of the employees that they weren't susceptible to the common fish diseases. I've now learned that that is not true, which is why I'm posting this before adding the clownfish. At this rate, it would be well beyond the 76 day period for diseases to go through their cycle, but would the wrasse being present in the tank prevent the diseases from dying off, even if it never caught the disease itself?

 

[OKCorals]

If the original wrasses had not been QT'd, and added to the tank, there is the possibility that the tank has parasites. Ich, velvet, brook, uronema are all possible. The current wrasse's immune system may be holding off the possible parasites. You could consider doing the "Black Molly" test to see if indeed there are parasites in the tank. But provisions should be made to house the molly after the test.

Black Molly Quarantine

** This information was originally posted here: https://humble.fish/community/index.php?threads/black-molly-quarantine.55/ ** Preface - Freshwater (FW) black mollies have been used for years in saltwater aquariums for algae control. However, this write-up will focus on their potential for...

www.reef2reef.com

Okay I've started to read your link and it says that wrasses have think mucous coats so even if they have a parasite, I may not be able to see it. But it also says they're very sensitive to treatments. So now I'm not sure how to move forward. I don't want to treat the wrasse and harm it if it doesn't have any diseases, but I don't want to have the clowns catch any diseases when I add them to the tank. Quite the conundrum.

 

[Big G]

Wrasses can be very sensitive to some treatments. Here's a chart listing the most common treatments on a scale of 5 as don't do it, to 1 being normally ok to treat.