Ich question
 

If my tang just started showing ich but is eating do I need to quarantine all my fish?

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Yes. If one in a tank is exposed, they all are. The DT will need to be fallow (fishless) for a minimum of 72 days while your fish are in QT. I would strongly recommend using the Tank Transfer Method (TTM). If done properly, it is 100% effective.

Good Luck!

+1 to what billdogg said

Just lost a clown tang to ICH..

Unfortunately maybe, but Billdog is absolutely right.
Do not underestimate this parasite, respect it.
Break the cycle and its toast!

Not sure where the maybe comes from.....no maybe........it's a must

Trust me I just went through this. Lost 5 fish to ich thinking I had enough time to QT. They all died within 2 days of noticing the first spot. 3 lost in TTM, 2 lost in the display, other 3 are doing OK going through TTM.

While I do actively TTM and QT all my fish, I think the recent CUC addition brought it in as I have not seen a speck of ich on any of my fish in 2 years, until 3 days after I added some more CUC.

I will QT anything wet now!

Yup, I admit it's hard to do, but it's the only way.
Not just for Ick, but for all the others which try to sneak into our DTs
Ever since I followed a 30 day QT, with half dose cupramine for fish only, and dip and inspect corals, never had a problem again, no Ick, no flukes, no red bugs, no flatworms, no nothing and I like it this way. I totally am against hitchhikers As well as if they are free, likely trouble, especially crabs.