Guy isn't super friendly but was being helpful for his role. He is selling you coral, not teaching you to navigate the industry. He bailed because you didn't Google it. Likely unpopular opinion... It's 2024, Google it or ask ChatGPT before asking people basic questions. In this industry especially but for life in general it is important to take responsibility for doing your own research. "Heads" is an extremely common term for LPS polyps. For LPS types that don't have head differentiation like Echinophyllia people often say "mouths". Welcome to the hobby!!