All of my recent male bettas have been tail-biters. I've tried everything to de-stress them, everything to keep them from being bored, and nothing works. Since they ALL do it, I suspect it's a source water issue. Since I change around 20 gallons of water a week, it's just not practical for me to buy RO water to do my water changes, so I've been thinking of setting up my own unit. Has anyone done this? I don't even know where to start! About how much did it cost? What does it look like? Any tips or advice would be greatly appreciated!