I have about 8"x8"x8" bowl with some rocks and live plants and one male betta. It looks pretty nice except that activity is limited to only that one fish. I was thinking about adding a few more fish and was wondering if it would be okay. I was thinking about 2-3 cherry barbs or white clouds. Would this overload my bio balance and would the betta be bothered by the extra fish or even kill them for fun? Just wondering....