its all a case by case basis. i have seen local fish stores that do everything right but for some reason end up with ick and i have seen walmart tanks that are filled with perfectly healthy fish.
Walmart tanks are clean it's just that they do not turn off the lights or conceal the tanks from lights...their lights are on 24/7 and this is fish cruelty. Fish need and demand day and night cycles, but they are ignorant and don't care.
I am planning on making formal requests that they change this.
Another prob with larger fish stores and even LFS's is that they do NOT present the natural correct and appealing tank environment for people to see and take notice.
They are plain empty tanks with no aquascaped varieties for display presentation. Healthy planted aquascaped aquariums displays will sell products and fish.
"It's all about effective marketing and presentating a proper package." A lush and clean healthy aquascaped tank with vibrant natural green/red colors should be the norm, bu unfortunately even when I was in my youth the common well known aquariums were with colored rocks and fake décor....PLEASE!!! a tank should look like a natural body of water that is seen and inhabited primarily by the way nature intended it and provides natural resources.
The mechanisms for a antural proper freshwater
tank are as such.....
Wood, rocks/gravel, appropriate ph'd water and clean to some degree, filtration and appropriate fish compatible to the environ. Just as saltwater
tanks should have living coral, sand, appropriate water perimeters, water circulation and appropriate fish.