3" in diameter and 4 heads! WYSIWYG and fully aquacultured by WWC! This is our most favorite Duncan of all time! Gone is the average run of the mill neon or lavender tipped duncan of old. With its neon green mouth and grape purple ring and long sweeping polyps, This Duncan is the &^%@! We've been growing out the WWC Dream Catcher Duncan for over 4 years now and it is a proven grower and never loses its color. For best growth and tentacle extension, make sure to target feed with a good quality frozen food once a week and keep it in an area of low alternation flow and low light of around 125 par.Lighting = Low Light at around 100 to 150 parFlow = Low to Medium Alternating FlowFeeding = Good Quality Frozen LPS Food 1x / weekly