Quarantine surviving fish after velvet outbreak?

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obw86

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Hello everyone, first post on the forum, have found some really useful information in here since getting into the game about a year ago. If anyone can give me any advice I would be very grateful.

I have a 100 L tank with several LPS corals. Originally I had two clownfish, unfortunately one jumped out during cleaning and I didn't notice. I bought a replacement from the same shop, acclimatised it but didn't quarantine, and it died within a few hours. My original surviving clownfish then started to look unwell, and died within a week of the new clownfish being added. A different LFS were certain that this was velvet, going from a picture which is hopefully attached. I now only have one Molly miller blenny, a cleaner shrimp and some snails. I've been watching the blenny for signs of disease, but it seems ok, not obviously unwell, still feeding and behaving normally. Quite difficult to spot skin changes due to its colour, especially compared to the clown.

I have now bought a second smaller tank as a quarantine tank for any future fish, and I've added some rock from my original tank and bottled bacteria to try and kick start a cycle. My question is, should I keep the blenny in my original tank and hope it survives, or move it to the quarantine tank and treat with copper, at the risk of stressing it and adding it to a tank that hasn't properly cycled?

I tested my water parameters the day after the last clown died and they seemed okish apart from low alkalinity:

Ammonia 0 ppm, nitrate 10 ppm, pH 7.8, temp 25 Celsius, salt 35 ppt, alk 6.3.

PXL_20251220_203908172~2.jpg
 
Here is the issue. If your tank had a fish with a parasite like velvet or ich, that will remain in your tank as long as you have a fish in there. You can go 2 ways. Take all fish out for 60 days . QT the fish.
Or
You can try to manage the parasite. Live food, UV light ect….
 

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