I was talking to a sales clerk at the pet store looking for a suitable match to place with my tiger oscar in a 75 gallon tank. They told me that Bumblebees would be perfect because they would be able to defend themselves of the Oscar got aggressive. I ended up buying two and putting them with my oscar. So far I've had no problems however I've been hearing that eventually there could be aggression issues from the Bumblebees. Should I remove them or just keep an eye on the situation? Any advice please.