Stick to blues from an established line. English blues from petstore lines still have problems hemmoraging during birth. We had that happen recently here.
Really, your best bet is to get from a feeder breeder that knows the health of each color they are carrying. Like Morphie knows that her fawns don't birth well, but her blues are fine.
Things like that will go far into improving your colony, not filling it with crap rats.
Regardless, make sure you QT new rats. You don't want to bring some home only to have it infected with many of the diseases rats have, and wipe out most or all of your colony very quickly.
BTW, there are no lucy rats, it's called a black eyed white, and it is a very high white rat. High whites are a very high risk for megacolon. Google it.
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