I have talked with new new owners of Fish 2000 a few times since they took over.
The previous owner died a little while back and I believe the place was being run by family. The owner of Sand Bar in Costa Mesa was approached to buy, but the place needed so much work he took a pass on the deal.
The new owners are a husband and wife with one of their friends. They are friendly people and strike me as people who care about their customers.
The whole place has been gutted so they can start over. The plumbing on the original set up was a nightmare, the filtration beyond repair and the shark tank was leaking. Currently, they are filling in the shark tank and redesigning to handle birds and other small critters. They will continue to stock saltwater and the owner of Sand Bar will be doing most of their buying.
The last time I visited, they were hoping to remain open so customers could continue to buy water and food. Since that conversation, however, I have not seen their door open (and I usually grab lunch at the brewery once a week).