I just went to the petsmart around the corner from me the other day, and they usually have all their bettas in the blue tinted water (i think the stuff they put in there is called methalyne blue??). This time, they only had their "halfmoons" and "dragon scale" bettas in the blue water, all the veiltails, crowntails, and females were in clear water. The halfmoons and dragons were all super active and flaring like mad at eachother. But the veiltails, crowntails, and females were all clampy and sad looking. There were actually two crowntails that had the blue water, and they were acting all tough and flaring at their mopey counterparts. None of the bettas I saw were actually sick, and the cups were all clean. Is that blue stuff really beneficial for bettas or something??? Or does it just make them feel more secure since it makes the water more murky??