All fish have Ich in them when you buy them.
If its just a few specks, most likely the fish will fight it off with a little help by us (garlic, higher temp, lower salinty, etc).
The best way to insure that your new arrival doesn't affect other fish is a QT tank for 4 weeks (Ich has a life cycle from 6-28 days).
Most store won't take back a sick fish, but will do their best to help you solve the problem.
Just because a store says they QT a fish for 2 weeks doesn't mean they are 100% healthy as the Ich may still be present.
We get deliveries 3 times a week, and I would never be able to QT my tanks for 30 days at a stretch, I wouldn't have space for it.
We do our best though, making sure they are eating, and aleviating stress.
Ken - BWA
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