I Did it, im doing it yes gar will eat the RBP. HOWEVER if you feed your gar live food, flood the tank with what ever your feeding them (lets not exceed filtration though) but so far i have 100% survival but i had to save two. As long as you maintain the feeder fish population you shouldn't have a prob. If you can avoid it I wouldn't suggest it. But I had unusual circumstances that kind of forced my hand, however to my surprise its working, I think my RBP are about the same size as yours. If your confused about flooding the tank with feeders, ill post a pic if you need one. Don't do this for long.