I have a carpet dominated tank with 7 right now in a 250. The fish I have have lived with some of the same carpets for the past 15 years. I have been very lucky I have not lost fish to my carpets in many, many years (knock on wood). There is always a risk nonetheless. But yes anemone only tanks with sand, lr, very good lighting, macroalgae, and only clowns are the way to go with carpets. That would be my dream tank.