About
For more than three decades, Fish Den Inc. has been a fixture of Denver's aquarium scene, and the devotion of its regulars tells the story. This is a no-frills, old-school fish store packed wall to wall with tanks — freshwater up front, a saltwater section in the back where small sharks cruise their enclosures and draw kids and grown-ups alike to press against the glass.
It isn't a polished showroom, but reviewers keep returning to the same words: clean tanks, healthy fish, and prices that beat the big-box chains. The freshwater selection runs deep. Shoppers in Denver, CO regularly leave with kuhli loaches, black ghost knife fish, pygmy corydoras and other catfish, harlequin rasboras, rainbow fish, cherry and ghost shrimp, blue mystery snails, and even crayfish.
The live aquarium plant section is a genuine draw — several customers say they finally found plants here they couldn't source anywhere else in the Denver metro. On the marine side, corals and saltwater fish give this aquarium store a real reef corner, and rarer, hard-to-find species turn up often enough that hobbyists drive past closer shops to see what's in stock. What keeps people loyal is the staff.
Michael and Ryan get named again and again for patient, honest help — Ryan for putting up with a nervous beginner's endless questions, Michael for the kind of deep knowledge you can't fake. The owner is hands-on and clearly cares more about the hobby than the sale: customers describe being walked through dropsy and fin rot treatments, having a broken pump swapped out, and a stuck piece of gravel fished out of a big-box filter on the spot. Equipment, fish food, medications, decor and dry goods round out the shelves, and parking out front is easy.
Whether you're stocking a first 10-gallon or hunting a rare specimen, Fish Den is a trusted source for healthy fish for sale in Denver, CO — earning its reputation one clean tank at a time.
What they offer
Fish & livestock for sale at Fish Den Inc. in Denver, CO
Fish Den Inc. stocks corals, invertebrates, shrimp, catfish, rare and hard-to-find species, aquarium plants and freshwater & saltwater fish for sale in Denver, CO. As an aquarium store serving Denver, CO, it also carries aquarium equipment, fish food, fish medications and dry goods and offers aquarium consultations, equipment repair and water testing.
- Livestock & products
- Live PlantsCoralsInvertebratesShrimpCatfishRare SpeciesAquarium EquipmentFish FoodMedicationsDry Goods
- Services
- Specializes in
Highlights
What makes them special
- Over 30 years serving Denver's freshwater and saltwater aquarium community
- Small sharks on display in the back saltwater section
- Deep live aquarium plant selection customers say they can't find elsewhere in the metro
- Staff like Michael, Ryan, and the hands-on owner known for honest advice and on-the-spot equipment fixes
- Healthy freshwater stock — kuhli loaches, black ghost knife, corydoras, harlequin rasboras, shrimp and snails — priced below big-box stores
From keepers
Customer reviews
“Amazingly high quality, healthy, beautiful fish. Best prices anywhere I have been. Spend your money with these wonderful people at a family run, locally owned business. Don't waste your time and money at Petco/Pets mart or any other bug box store.”
— daniel haley5.022 hours ago“tough! theyre well stocked and helpful etc but when i finally made the plunge and got some shrimp, the shrimp came with planaria which i am now struggling to get out of my tank 🥲”
— chik2.0a week ago“Wanted to make another post. I was working with Ryan. Absolutely salt of the earth guy. He was helpful, i had a few questions about rainbow fish. He is honest and spends the time to understand your needs as a fish owner. I seriously pass 2 other fish stores to come up here because of guys like Mike and Ryan. Whatever you guys pay Ryan, he deserves a raise😀 Michael helped me. Super knowledgeable and really cool. I live in south Denver. I pass by a few other fish stores to come here for the great service and selection. Great guys and selection”
— Joel5.0Edited a week ago“They seem to have everything I will need when I am ready to start my tank. They have a large selection of freshwater and saltwater livestock.”
— Neon Frogs4.02 weeks ago“I’ve had my tank since September 2025 and Ive been in and out of this store so much because I don’t really know what I’m doing 😅 and they’re always so helpful! I’ve had a few incidents with my fish and they’ve helped me figure it out every time. Great store for someone just starting out with fish or someone with previous experience. Shout out to Ryan for putting up with my paranoia 🤠”
— Cora Yoder5.02 weeks ago“5 stars, 10 stars, great business! Helpful but not overbearing, friendly, but not pushy. And did I mention the amazing selection of fish? Some hard to find. And CLEAN CLEAN CLEAN. I don't know how I didn't know about this place before now as a hobbyist. We didn't get much on this trip, 4 snails and a 12 fish school of harlequin rasboras for my son's nano tank. All are doing great after acclimating and living in their new home for half a day. Couldn't be more impressed with this store. Everyone was so friendly. HIGHLY HIGHLY HIGHLY recommend. Go here instead of Petco or Petsmart. Support a local business and get healthier fish!”
— James E5.02 weeks ago“Overstocked fish tanks and parasite infested shrimp tanks. Didn’t get any pictures of the fish tanks but got some pictures of the planaria all over the shrimp tanks.”
— Jasper Haddad1.04 weeks ago“They has the best fishkies”
— Michael Openmouthfartstein5.0a month ago“Best fish store. Great knowledgeable staff.”
— J'Amy McLellan5.0Edited a month ago“Friendly service. Nice selection”
— Naomi Kates5.0a month ago
Reference
Frequently asked questions
Note — Store information and services may change. Always call (303) 458-0376 to confirm current availability, hours, and services before visiting Fish Den Inc..