1. Your tank likely did not finish cycling because your ammonia and nitrite readings should be zero at all times. As tjere was no scratching or gasping for air, this was the likely cause of the death of all you fish.
2. Once you have measured to ensure you have zero readings you should wait one month before you add fish and than only add one fish each month. Success in this hobby relies on patience.
3. Did you tell your LFS you only have a 30 gallon tank?
Tangs require a 6' tank that provides them with the swimming room they need. Please wait until you have a suitable tank to accommodate a tang.
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