Your tank looks very nice, but a few of the fish I see are going to need an upgrade. That eel (fire eel?) you have will get huge and a 20g is not sufficent. Also the angels would eventually need an upgrade as well.
Do elaborate about marineland aquariums and your paranoia. With how many people are in this hobby, every now and then you're sure to see a few bad tanks. And people religiously posting about them. My 125 is a marineland, I had a 20g long that was a marineland. My mother bought and I setup a 10g marineland that the dog broke. Long story short, 200 pound great dane.Thanks for the input. Thought about the need to upgrade. I actually downgraded from a 37 to a 20 after increased paranoia of the quality in marineland aquariums. When the time has come and the fish are a bit bigger. Ill invest in a higher quality and larger aquarium.