I'm going to go against the grain here and say the buyer is too picky
You said you had problems with 4 marine land tanks. Now problems with this builder.
In my opinion if you want the absolute perfect tank then you should be talking to miracles, age, or reef savvy. And if you can't afford that then you need to take your medicine snd be happy with marineland or what you got now. That's just how life is
I'm not saying for the money you spent you shouldn't get a good tank. But at certain price points you just can't ask for perfection. And that's with anything.. cars, houses, you name it