Start Selling. Get Paid. Build Your Aquarium Empire.
Join the best aquarium marketplace on the planet — designed for hobbyists, breeders, and creators to showcase and sell with ease.
Selling made EASY!
Made for Hobbyist
Built by and for the fishkeeping community — not big box brands.
Low Fees, More Profit
No listing fees. Just a low commission when you actually sell.
Anything Aquarium Related
Fish, 3D prints, plants, gear, art — if it helps the hobby, it belongs here.
What You Can Sell?
Whether you’re printing custom moss holders or breeding rare shrimp — your creations have a home here. Sell live fish, plants, test kits, 3D decor, aquarium art, bundles, and everything in between.
How it works
1. Create Your Shop
Sign up in minutes — free, easy, no coding required.
2. Add Products
Upload fish, gear, handmade items — anything aquarium-related.
3. Get Paid
Orders come in, you ship, and we help you grow.
Top 5 FAQs for Your Seller Page
Do I need a business license to sell?
In most cases, no. Many of our sellers are hobbyists or creators selling small-batch items. However, it’s your responsibility to check with your local authorities to see if you need a license based on your income, products, or location.
What kinds of items can I sell here?
You can sell almost anything aquarium-related: live fish, invertebrates, plants, 3D printed tank decor, handmade accessories, art, or gear. If it’s safe, legal, and valuable to aquarists — it belongs here.
Are there any monthly fees?
No monthly fees! You can create your shop for free. We only take a small commission when you make a sale — so you don’t pay unless you’re earning.
Can I sell if I’ve never done this before?
Absolutely. Most of our vendors started as hobbyists. If you can upload a photo and ship a product, you’re ready to go. We’ve built the platform to make selling simple, even for first-timers.
Do I have to manage payments or taxes?
We handle the payment processing for you. You’ll get payouts directly after each sale. As for taxes, you’re responsible for reporting your income and following any applicable tax laws — just like with any other online marketplace.
What is the minimum age to become a seller?
You must be at least 18 years old to open a vendor shop on UndergroundAquarium.com. This aligns with U.S. legal requirements for entering into binding agreements and handling online transactions. If you’re under 18, a parent or legal guardian must create and manage the account on your behalf.