One thing that I've learned is that this is not a hobby for lazy people. But the entire appeal of this tank is that it's supposed to be easy and low maintenance.
I don't want to be a snob because I have a lot to learn myself. But I cringed when I read the review by the person who said she regularly did a deep clean of the tank and gravel. That thing will never be cycled. Like I said, I don't want to look down on anyone for a lack of knowledge because I'm pretty new. She probably thinks that she's doing right by her fish by doing this. But when you take responsibility for the welfare of a living being then you need to learn how to take care of it and give it a good life. And there are a lot of resources out there. Just buying this tank in the first place as a permanent residence for a fish shows that someone who's not doing the work of learning. Mistakes are one thing. A lack of effort is another.