Yes, you definitely can add Irish Moss to the boil to clarify the wart, when you don't care, if it's a stout or a porter you just don't add it, but if you are brewing a lighter beer, irish moss is your friend
(it does not add flavor, and you generally throw it in about 20 minutes to the end of the boil)
I would also recommend using stainless, enameled pot for the boil. I also recommend washing everything you are going to be using with B-Brite, it's a little expensive, but it's the best cleaner on the market today, it kills ANY odors too, so with your crayfish story, it would totally kill those odors
(yes it's that good)
I use plastic primary and glass secondary, i find it easier to work with a bucket for primary, and there are no plastic flavors added
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