I currently have a 7 inch jade goby and I want to have a tankmate with him. I only need one tankmate due to size and stuff. I am deciding on 3 fish, a bluegill (one I want the most), cow goby or a flowerhorn. I know the bluegill likes more of a colder water but, they're tough fish. Which of these three would be better? Any ideas or other tankmate suggestions?