go for it. get some cleaner shrimp. may help.
I've kept tangs for years and never had an ick outbreak and I don't bother to quarantine.
I put it down to a stable balanced system, the cleaner shrimp and wrasse may help... lol.
but do a through inspection as well. As you said though, healthy in a friend's tank probably is ok.
if you do grab all his fish, I'd be more concerned with your bio-load suddenly jumping from all those fish. Watch your nitrates/ammonia/etc.
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