About Fins Up Reef Co. | Littleton Saltwater Aquarium Store
Fins Up Reef Co. is a saltwater aquarium store in Littleton, Colorado, owned by Ryan Cullen. We help reef keepers choose livestock, care for their aquariums and plan new systems, with aquarium maintenance for homes and businesses across the Denver area.
Visit your local reef shop
Explore corals, saltwater fish, invertebrates and aquarium supplies in person, or shop our WYSIWYG livestock online. WYSIWYG means you receive the exact specimen photographed in the listing. Selection changes as individual pieces sell.
Meet Ryan
Ryan works hands-on with the store’s reef systems and customer aquariums. Whether you are choosing your first coral, looking for a showpiece clam or troubleshooting your setup, bring your questions and tell us about your tank.
Care before the sale
Our coral quarantine process includes three weeks of milbemycin oxime treatment with weekly potassium chloride dips. It is intended to reduce pest risk, not guarantee pest-free livestock. Read about our coral quarantine process and your own inspection steps.
Aquarium services
We offer saltwater aquarium maintenance, new aquarium projects and tank moves. Contact us with your location, tank size and goals so we can confirm availability and provide a quote.
Store location and hours
3625 W Bowles Ave, Unit 18
Littleton, CO 80123
Saturday: 10 AM–6 PM
Sunday: 10 AM–5 PM
Contact us for appointment availability.