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Unread 03/25/2020, 11:46 PM   #4
ThRoewer
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Join Date: Jan 2015
Location: Fremont, CA
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Two weeks of quarantine isn't enough. I generally do 2 to 3 months, longer if any fish shows the slightest signs of a possible infection.

Copper is a tricky treatment if you don't check the copper level in the water often enough. If the copper concentration gets too low it might just suppress symptoms and weaken the parasite for a while. This is particularly the case with Amyloodinium (velvet). Amyloodinium is not reliably treated with copper anyway as there have been copper resistant strains observed (copper still kills them but only at doses that are way over the lethality level for fish). And the low dose copper treatment you find at many wholesalers and LFS might be creating more copper tolerant Amyloodinium strains.

Even "normal" copper sensitive strains may survive and show back up if the copper level wasn't properly maintained throughout the full treatment period. In such cases, it may take up to 6 weeks before it the parasite shows back up.

Then there is acquired immunity of fish who survived a previous Amyloodinium infection. Those fish may carry the parasite but not get sick. They may, however, infect other fish.


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Pairs: 4 percula, 3 P. kauderni, 3 D. excisus, 1 ea of P. diacanthus, S. splendidus, C. altivelis O. rosenblatti, D. janssi, S. yasha & a Gramma loreto trio
3 P. diacanthus. 2 C. starcki

Current Tank Info: 200 gal 4 tank system (40x28x24 + 40B + 40B sump tank + 20g refugium) + 30x18x18 mixed reef + 20g East Pacific biotop + 20g FW +...
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