Best practice is that anything going in the tank should be quarantined. It's the only way to be 100% certain you're not introducing something.
Let me share a few mishap stories.
First off i have been qtying fish for over 20 year and commercially last 3 years.
In my entire 20 years i have only had 3 incidents where some fluke that were prazipro resistant made it to a clients tank.
1 incident on uronema in anthias that made it through to client as well. This is why i am not qtying chromis and anthias till i get my new system setup and try more aggressive treatment.
There have been a handful of incidents where someone emailed me after a month or 2 of buying fish from me, saying their system got ich or velvet etc. After step by step questioning, found out ALL of those clients bought either frags or rocks or sand or inverts from fellow hobbyist or LFS etc and placed it in their tank without qtying them.
So my advice to all hobbyist that qt is, Once you go quarantined fish, either from me or other sources, please make sure that you do not introduce anything into your tank without proper quarantine process. No frags, no corals, no rocks or sand and no inverts unless qted properly.
Also cross contamination. No on has ever emailed me on it but it has happened to me once. Using same net or tools from one tank to other can also cause nasty to transfer, In my case it was turkey baster i used to feed fish tanks with. Now i have separate tools for each system.
I love my clown pair and the story behind them and am really attached. I would be devastated if something happened to them over a silly hermit crab.
