I think most longtime members here know I'm pretty lenient when it comes to stocking and tank sizes (some may even say too lenient), so it's a rare moment when my opinion on it is swaying the other way. Whether keeping bettas in a 1 gallon or 1.5g, it's certainly better than being inside a delI cup. I certainly agree there. Add some easy, fast-growing plants, like frogbit and wisteria, some substrate, wood, rocks, and a few leaves to that 1.5g and it's, in my eyes, 100x better (I should know, as I've done this). Now that doesn't mean I feel a 2.5g is 100x better than that 1 gallon or 1.5g tank (at least, not significantly better). But arguing that a betta is better off getting daily human interaction--all the while kept in a mayonnaise cup--to be healtheir than being left alone in a well-planted, scaped 10 gallon tank that has plenty of cover and room to swim in sounds incredibly irrational. We're talking about a cup, the approximate size I use to dispense ketchup into at McDonald's or get served coleslaw in at Popeye's.