I like how in the second link they recommend adding underwater plants to "add important nutrients" to the water, then they provide a link to their plastic plants. What kind of "important nutrients" could their fake plants possibly be leaching into the water? Last I checked real underwater plants absorb nutrients, not leach them out (unless you consider O2 a nutrient).
I guess with Wal-Mart's cheap prices, they can't afford to hire a single writer that knows anything about fishkeeping. Ahh, the high cost of low prices.