If you want to make sure that you will not introduce ick, then yes you must treat with hyposalinity each new addition. It must be done with a good refractometer though, not a hydrometer as they are not precise enough. It's sad, it's long but with some liverock there is no need to do water change much.
I did an exception with my niger trigger wich I treated with Seachem Paraguard for 3 weeks because of a popeye so for him I did not use hypo treatment because the paraguard already kill the ick and some other parasites. Paraguard did not kill my liverock biofilter. It's never a good idea to combine hyposalinity with other medication.
Usualy hyposalinity does not stress the fish. The main problem come when you have some sensitive fish that must eat live food, like a mandarin because hypo kill all pods and invertebrates. Then maybe a simple observation for these would be ok. Mandarins are not very susceptible to ick anyway as they produce a very thick mucus.
You should use common sense too. Some fish are much less susceptible to ick. I would definitly treat all tang and all fish that are known to be susceptible to ich. The most important thing is a proper observation period of 4 weeks minimum to make sure you don't bring velvet in your tank. Marine velvet is a deadly thing.
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Originally Posted by TheNewGuy
Sorry for the misconception. I plan on quarantining all new additions, I was wondering whether to treat all new additions with hyposalinity while in qt, or only if needed.
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