Of the three wal-marts within 50 miles of me, one doesn't have fish, one just remodeled and has fewer, but cleaner tanks and apparently healthier stock(no gravel though, just a printed "gravel poster" under the bottom glass), and one hasn't been remodeled and still has the old tanks. The stock in that one looked like it left something to be desired. Just like the LFS in the area, it all seems to depend on who is minding the shop.