You know the interesting thing about this hobby especially for those of us that have been doing for a long time is that we probably all started off back in 90's some even further.. We probably all had a goldfish bowl, and then wanted something larger so we got a small 20 long with an undergravel filter which was a nightmare. Then we maybe tried some other types of filtration and broken heaters that just cracked and as we killed most everything we purchased the idea of having something more like sting rays or voltan lionfish was on the todo list. So we took our fresh water knowledge and decided to go salt. We had the tank and then needed filtration and we looked to many ways of doing that including a side hanging overflow that unfortunately lost siphon when the power went out over flowed the tank, then to the canister and so on..
The bottom line is that we learned through much money and countless failures. After about maybe 3 to 5 years you start to learn and become more patient. Personally I don't add anything to my tank until my baked rock is covered in coralline algae and a dark purple.
Thing is I have the patience and this is a hobby not a race. Everyone wants to fill their tank with things they have no knowledge about. I can't even begin to tell you the books I have read and still own regarding everything saltwater and tank and inhabitants related.
That looks like a great tank. With the knowledge I have I would never buy it. I'm sorry AIO tanks are decent but the truth is you can do it for a lot less with experience. Spending 1000's of dollars does not mean you have a better chance of success. It just means you have an expensive tank of water. Your tanks success is going to happen by being patient and learning along the way.
Personally.. I suggest you get a fishbowl. Learn to walk first.
But! since I know most people won't do that and basically just toss money at the problem and rush to fill the empty tank, well, go for it.. you're retired. It's just money
