I Would Like To Get Some Advice On Eels, Would Eel Owners Please Respo

[cgbender]

So last question before I buy fish. I have been going to the lfs for a couple weeks now and looking at the fish while waiting for the tank to cycle and what i have observed is that the peacock eels in there tank are anywhere from a half inch to about 6". The way it appers to me is that the 6" is the one that the have had the longest and then the ones that are about 3" are the second to last shipment and the smallest are the ones they got in a couple days ago. All seem to have no health conserns. So my question is which ones should I choose and what should I be looking for (besides the obvious health problems.)