Luv it! So peacefully, beautiful!!
"Luv it! So peacefully, beautiful!!"
SKU: 72031
FLOW 15 Aquarium with MCR Light - 4 gallon
Regular price
$208.99
More stock coming soon
- THE PERFECT AQUARIUM FOR SMALL SPACES — The FLOW aquarium has three transparent sides, so you can easily find a space to place and admire your biOrb. The 4-gallon tank's compact size is ideal for desktop or tabletop display.
- DURABLE CONSTRUCTION — biOrb aquariums are made from acrylic, which is 10 times stronger, 50% lighter, and 23% clearer than ordinary glass aquariums. Acrylic is also a good insulator, so you don't lose as much heat as you would with a glass aquarium.
- FILTRATION SYSTEM IS EASY TO MAINTAIN — All biOrb aquariums have a true 5-stage filtration system including biological, mechanical, chemical, water stabilization and oxygenation that keeps it clean. The filter is conveniently located at the bottom of the aquarium, and the ceramic media surrounding it promotes the growth of beneficial bacteria.
- VIBRANT, MOOD-ENHANCING LIGHTING — Use the included remote control to select one of the 16 preset colors, fade through the entire spectrum of colors, and control the brightness of the LED lights. You can also set automatic 8-, 10-, 12- or 14-hour day and night cycles for a more natural scene for your aquarium inhabitants. This natural cycle helps cut down on algae blooms, which benefits fish health, water quality, and cuts down on routine maintenance.
- EVERYTHING YOU NEED TO GET STARTED, JUST ADD DECOR — Includes a 4-gallon (15 L) acrylic aquarium, multi-colored LED lighting with remote, a new quiet air pump, a low-voltage 12V transformer, filter, air stone, ceramic media, starter water treatments, and instructions. Just add decorations! Also includes a 2-year warranty.
Dimensions: 8.2 x 11.8 x 12.4 inches (20.8 x 30 x 31.5 cm)
Volume: 4 gallons (15 L)
Lighting: MCR LED
Voltage: 12V AC
Warranty: 2 years limited
Keep your fish happy and your biOrb clean and clear with routine maintenance. Depending on your choice of fish, you may only need around 15 minutes of maintenance per month. Plus, you only need a few key tools to keep it looking great.
See the instruction manual for more details.
Stock up on Service Kits so you're always prepared for a filter change!
Must-Have Accessories
FLOW 15 Aquarium with MCR Light - 4 gallon
Why Choose a FLOW Aquarium?
All-in-One, Easy to Set Up
Every biOrb aquarium comes with everything you need to get started—filtration, lighting, and air pump included. Just add water, choose your décor, and you’re ready to enjoy your new underwater world. No complicated parts, no guesswork. It’s nearly effortless from day one.
5-Stage Filtration Design
Our filtration system is located at the bottom of the tank (where waste naturally settles) for maximum effectiveness. It combines biological, mechanical, chemical, water stabilization, and oxygenation to keep your aquarium clean and your fish thriving.
Crystal-Clear, Durable Acrylic
Crafted from premium acrylic that’s up to 10x stronger and 23% clearer than glass. It offers brilliant visibility from every angle and helps insulate water temperature, adding stability to your aquatic environment all year round.
Low Voltage LED Lighting
Every biOrb includes low voltage LED lighting. Choose from standard white LEDs or upgrade to MCR (Multi-Color Remote) models that let you shift between 16 colors and simulate natural day-to-night lighting cycles.
Modern lines. Clear perspectives.
The biOrb FLOW features a crisp, rectangular design with three transparent sides, perfect for positioning against a wall or in a corner without losing the immersive experience. Its clean lines and sculptural form make it easy to admire your underwater world from multiple angles, bringing a modern sense of calm to any space.
All-in-One, Easy to Set Up
Every biOrb aquarium comes with everything you need to get started—filtration, lighting, and air pump included. Just add water, choose your décor, and you’re ready to enjoy your new underwater world. No complicated parts, no guesswork. It’s nearly effortless from day one.
5-Stage Filtration Design
Our filtration system is located at the bottom of the tank (where waste naturally settles) for maximum effectiveness. It combines biological, mechanical, chemical, water stabilization, and oxygenation to keep your aquarium clean and your fish thriving.
Crystal-Clear, Durable Acrylic
Crafted from premium acrylic that’s up to 10x stronger and 23% clearer than glass. It offers brilliant visibility from every angle and helps insulate water temperature, adding stability to your aquatic environment all year round.
Quick, Clean Filter Changes
Designed with simplicity in mind, our filter cartridges are easy to replace—no tools or messy cleanup required. It’s a cleaner, faster way to maintain your tank without disrupting your aquascape.
Low Voltage LED Lighting
Every biOrb includes low voltage LED lighting. Choose from standard white LEDs or upgrade to MCR (Multi-Color Remote) models that let you shift between 16 colors and simulate natural day-to-night lighting cycles.
Styled Aquariums Made Simple
Love the full setup? Get the entire look in just a few clicks, or mix and match individual pieces to make it your own.
What’s Next? Personalize Your Aquarium
Curate Your Underwater World
Your aquarium should feel like a living piece of art. Our curated décor collections let you express your style—lush plants, sculptural centerpieces, and natural elements designed to enhance both the tank and the lives inside it. Mix, match, and make it yours.
Smart Add-Ons, Seamless Upgrades
From replacement filters to upgraded lighting, our accessories keep your biOrb running beautifully. Every piece is designed to fit perfectly and function effortlessly, so you can spend less time adjusting and more time enjoying your aquatic escape.
Questions? We've Got You.
Are biOrb aquariums freshwater and saltwater compatible?
Yes. biOrb aquariums come with everything needed for a freshwater setup. For a saltwater setup, you can adapt the Service Kit by removing the foam. You would then need to source the salt and hydrometer at your local pet store. If a higher-intensity light is needed, there are a few add-ons you could source. We recommend using an 8-gallon or larger biOrb aquarium but always consult your local saltwater aquarium shop for best results. See our tips and tricks for more details.
How often do I need to clean a biOrb Aquarium?
We recommend a simple cleaning routine every 4–6 weeks. biOrb aquariums feature an integrated 5-stage filtration system that keeps water clearer for longer, minimizing maintenance. With our biOrb Service Kits, replacing the filter is quick and mess-free. Just a few minutes of care helps keep your aquarium healthy and beautiful.
Is the FLOW a good choice for beginners?
Yes, the biOrb FLOW is perfect for beginners and hobbyists alike. It comes as a complete kit with everything you need to get started, including a filter, air pump, LED lighting, and water treatments. Its all-in-one design removes the guesswork, making it easy to set up and even easier to enjoy.
What kind of fish can I keep in a FLOW aquarium?
The type and number of fish will depend on the size you choose:
- FLOW 15 (4 gallons): Ideal for small shrimp, snails, or a single betta.
- FLOW 30 (8 gallons): Great for a small group of white cloud minnows or tetras.
We always recommend cycling your tank first and checking with your local aquatic specialist to make sure your fish are a good match.
What makes the FLOW different from other biOrb aquariums?
The biOrb FLOW features a sleek, modern design with three transparent sides, ideal for placement against a wall or in a corner without losing visual depth. Unlike the rounded styles of the CLASSIC or HALO, FLOW’s crisp rectangular shape offers a more architectural look that blends beautifully with contemporary interiors.
Each biOrb aquarium shares the same filtration technology, high-quality acrylic build, and easy-care promise—so you can choose the shape that best suits your space and style.
Does the MCR light turn off completely at night?
Not automatically. The MCR timer ends in a soft blue “night mode,” not full darkness. This setting is designed to mimic moonlight and provide a calming nighttime environment for your aquarium. If you prefer complete darkness, simply turn the light off using the remote or inline switch.
Does the MCR timer work with color options?
No, the timer function works with white light only. When you set a timer (8, 10, 12, or 14 hours), your biOrb will follow a natural white-light cycle—starting in deep blue, rising to white, then returning to blue “night mode.” Colored lighting options must be selected and adjusted manually.
Flexible Payments, No Compromises
Bring home the extraordinary without the wait! Split your purchase into flexible payments with as low as 0% APR when you checkout with Shop Pay*
Overall rating: 5.0 / 5 from 2 reviews.
AI Generated Review Summary
Summary topics
Review topics: [].
Review highlights
Reviews
So far love my aquarium
"So far love my aquarium will be adding fish soon"
Q&A
- Where does the heater go and which one/type do you recommend?
- Hello Bridge. We carry a biOrb Heater Pack that is sold separately, https://us.biorb.com/products/45999 The biOrb Heater Pack is designed to be compatible with all biOrb aquarium models, except the HALO 15 (4-gallon). It includes a heater stand with suction cups that allow you to firmly attach the heater onto both curved and flat surfaces of your aquarium. We hope this helps!
- What are the exterior dimensions of the tank
- Hello Jacob. The dimensions are 12.4 in. x 8.2 in. x 11.8 in. You may also refer to image #4 above for the dimensions. We hope this helps!
- Hello, My bubble tube and filter are loose. Is there a way to get it tight again after changing filter? It just spines when I turn left and right.
- Hi Jason, The bubble tube has tabs on it that allow it to lock into place. You can try pinching the tabs to help them lock in correctly. Or you can get a replacement part through our warranty program, you would just need to contact our Customer Care Team with a proof of purchase at https://us.biorb.com/pages/contact or 1-888-755-5646. Our office hours are Monday through Friday, 8:30 AM to 5:00 PM ET. We hope this helps!