I just bought a reefer 525XL last month and it had a small defect with whatever glue they used. I contacted red sea and they sent me a new one and didn't want the old one back. It holds water just fine but as you can see in the picture some sand got into the crack and I just worried about this in the future. If you caulk it up I'm sure it would be fine. I have the pallet the new tank came on all you'll need is a stand and the plumbing. I'll take $150 for it or open to frags. I live in downtown Portland.
Jeffrey