If it doesn't kiss the glass then it's a Albino giant gourami (Scientific Name: Osphronemus gourami) grows to 24". Many years ago a LFS had a 14" one that was raised vegan and lived with many small fish. I used to feed mine grapes, he would toss them around before eating them. He could see the fish food can across my living room and start begging Immediately. Good luck!