You still want to quarantine the 72 or 76 days, though. They may have come from a fishless system at liveaquaria, but you can bet liveaquaria doesn't keep them in those systems for 70+ days before they turn them over and sell them. Meaning...liveaquaria may have only had those inverts in their system a week or two before you bought them. You can bet they were in a fish system prior to liveaquaria. This hobby is about risk management, so depends the level of risk you're willing to accept. Me... I'd quarantine!