Quarantine should be practiced for a minimum of 90 days when bringing new snakes in, especially if there are any signs of health problems. You really shouldn't be housing any snakes together unless you're intentionally trying to breed. I would strongly suggest getting separate enclosures for each snake and keep the new one as far away from your established collection as possible, although since you said you already housed them together your quarantine is shot anyway. I'd separate them all at this point and consider this day 1 of quarantine on ALL of your snakes, not just the new ones. No telling what you could have introduced to your collection by putting them together...
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