This is probably unlikely but I'm wondering if the mosquito fish is compatible with a beta or would work well in a community tank?
Hi IMHO mosquito fish -Gambusia affinis can be VERY scrappy little fish and are NOT recommended for a community tank.I also would not put Betta's out side this late in the season in MA. I'm in Indiana and only have another month or so before i have to bring in the tropicals i have outside.Best Wishes