also just wanted to add that Marine Labs (such as the ones where I've worked and studied) use flow-through, which means fresh seawater is filtered and run through our tanks. In essence, then, the aquaria in the labs become an out-pocketing of the ocean.
This is different, though, because these are not home aquaria. The animals were obtained from that source water, so they are accustomed to those conditions. This is in contrast with your home tank where the animals are not native to those waters, and might possibly be exposed to pollutants, diseases, and parasites unknown to them.
I'm not trying to sound mean. I just want you to know the risks, and make a decision that's best for your fishes' health.