I have a male betta. I also had them in a 5 gallon tank. It is on my side table by my chair so I can enjoy watching them. I have other tanks but I'm not sure they would do well in those either. I have a gold severum in a community tank. I think he ate my dwarf crayfish that I had in there. I can't find him anywhere. I know they are predatory fish but I had to move him from my larger tank because my blue acara was bullying him relentlessly. I love my dwarf crayfish