IceCap All-In-One Cube Aquarium, 20-Gallon
SKU: IC-AIO20G
MSRP: $ 236,76
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Available Through Authorized Retailer
- Optically Pure Low-Iron Glass: Assembled using highly polished 6mm low-iron glass panels (6mm) to optimize light transmission and ensure true-to-life coral color rendition.
- Three-Stage Rear Filtration Wall: Spacious back-compartment baffle grid isolates and conceals all filtration hardware, keeping your main aquascape clutter-free.
- High-Circulation Return Utility Pump: Bundled with an energy-efficient ~265 GPH submersible pump (~1000 LPH) that provides optimal turn-over rates for delicate livestock.
- Reusable Mechanical Sock Pre-Filter: Includes a durable 200-micron mesh filter sock that traps fine suspended particulate waste before it can decay into nitrates.
- Pre-Installed Shock-Absorbing Base: Features a factory-bonded, self-leveling foam mat on the bottom glass pane to relieve structural stress and protect table surfaces.
- Rimless Contemporary Architecture: Clean, open-top rimless profile blends seamlessly into office desktops, countertops, or modern living areas.
IceCap
Premium aquarium equipment without the premium price. Protein skimmers, pumps, reactors, heaters & more.
Handmade 20-Gallon Cube AIO with Low-Iron Glass and Three-Chamber Filtration
The IceCap 20 Gallon Cube AIO Rimless Glass Aquarium is a handmade all-in-one system that integrates a three-chamber filtration compartment directly into the back of the tank, eliminating the need for an external sump or hang-on-back filter in a 20-gallon build. The front and side viewing panels use 6mm Low-Iron glass — a material that removes the greenish tint present in standard aquarium glass and renders the colors of fish, coral, and live rock closer to their actual appearance. IceCap includes Low-Iron glass on the side panels as well as the front, which matters in a cube format where side-angle viewing is part of the daily experience.
The tank measures 18 x 18 x 16 inches — a nearly cubic footprint that delivers the proportionally taller viewing profile that reef builders and aquascapers choose cube tanks for. The three-chamber back section divides into a pre-filter chamber (3.2 inches wide), a main filter chamber (8.2 inches wide), and a pump chamber (3.75 inches wide). The filter chamber's width of 8.2 inches is generous for an AIO tank this size: it accommodates a nano protein skimmer, heater, ATO probe, and filter media simultaneously without stacking constraints. A Mesh 200M filter sock is included for the pre-filter chamber, and a 211 GPH (~800 LPH) return pump is included, making the tank ready to plumb and fill from the start. A self-leveling mat comes pre-installed on the base.
Key Features:
- Handmade all-in-one rimless glass aquarium; 20-gallon cube format (18 x 18 x 16 in)
- 6mm Low-Iron glass on front AND side panels for true-color viewing from all angles
- Three-chamber AIO filtration: pre-filter (3.2 in), filter chamber (8.2 in), pump chamber (3.75 in)
- 8.2-inch filter chamber accommodates a protein skimmer, heater, ATO probe, and media in one compartment
- Included Mesh 200M filter sock for the pre-filter chamber
- Included 211 GPH (~800 LPH) return pump — no separate pump purchase required
- Included plumbing for ready-to-connect AIO setup
- Self-leveling mat pre-installed on the base
- Rimless construction for unobstructed top-down and open-top builds
- Freight shipping; arrives protected for glass transport
- 1-year limited warranty (see warranty details for modifications and stand exclusions)
Ideal For:
- Reef and marine hobbyists starting or upgrading to a 20-gallon saltwater system who want a complete AIO platform that does not require a separate sump, stand plumbing, or external filtration equipment to run
- Aquascapers and planted tank builders who want the cube format's equal-width depth and taller vertical profile for a Nature Aquarium-style layout where foreground and background planting depth matters
- Hobbyists stepping up from a 10-gallon nano system who want a meaningful volume increase and display upgrade while keeping the desk or countertop footprint manageable at an 18x18-inch base
Pro Tips:
- Never Turn On or Cycle Your Return Pump While the Rear Chambers Are Dry. Submersible aquarium pumps depend on water to lubricate their ceramic shafts and cool the magnetic impellers. If you turn on the return pump while the rear chamber is dry, it can quickly overheat and damage the motor or cause electrical problems. Always fill both the main viewing area and the rear filtration zones with water before powering on the system.
- Rinse the Mechanical Filter Sock at Least Twice a Week under Fresh Water. Because a 20-gallon nano tank holds a small, highly concentrated volume of water, trapped food particles and organic fish waste caught inside your 200-micron mesh filter sock will decay quickly. If left uncleaned, this waste breaks down rapidly, spiking your nitrate and phosphate readings. To prevent nuisance hair algae outbreaks, pull the filter sock out every 3 to 4 days, flip it inside out under a warm kitchen sink tap to flush debris, then pop it back into place.
- Use the Middle Rear Filter Chamber for Your Heater and Auto Top-Off Sensors. When organizing your rear support gear, place your glass heater element and automatic top-off (ATO) water level sensors directly inside Chamber 2 (the center chamber). The water levels in Chambers 1 and 2 remain fixed due to the glass baffle layout, while the water level in Chamber 3 (the pump room) drops continuously due to everyday evaporation in the room. Placing your heater or sensors in the center chamber protects your heating element from running dry and prevents your ATO from accidentally dumping too much freshwater into the tank.
What’s Included:
(1) IceCap 20 Gallon Rimless Low-Iron Glass Cube Aquarium Tank
(1) High-Efficiency ~211GPH (800LPH) Submersible Return Water Pump
(1) Complete Rigid Return Plumbing Set with Adjustable Flare Jet Nozzle
(1) Drop-In 200-Micron Mesh Mechanical Pre-Filter Sock
(1) Factory-Bonded Protective Bottom Foam Self-Leveling Base Mat(Pre-Installed)
Technical Specs:
Official Manufacturing Title: IceCap 20 Gallon Cube AIO Rimless Glass Aquarium
SKU / Factory Part Identifier: IC-AIO20G
Total Exterior Dimensions: 18 Inches x 18 Inches x 16 Inches (45.72 cm x 45.72 cm x 40.64 cm)
Structural Glass Thickness Configuration: 6mm Pure Low-Iron Glass Panels
Chamber 1 (Pre-Filter Section): 3.2 Inches x 3.2 Inches x 15 Inches
Chamber 2 (Media Skimmer Section): 8.2 Inches x 3.2 Inches x 15 Inches
Chamber 3 (Return Pump Section): 3.75 Inches x 3.2 Inches x 15 Inches
Primary System Water Volume Capacity: 20 Standard Liquid Gallons (76 Liters)
Warranty
CoralVue, Inc. hereby guarantees this product to be free from defects in material and workmanship for a period of:
- 1 Year
Warranty is activated on the date of purchase.
This Standard Limited Warranty applies and is limited as follows:
- To the product only as long as it remains in the possession of the original purchaser.
- To the product that has not been subject to accident, misuse or abuse.
- To the product that has not been modified, altered, defaced, or had repairs made or attempted by other than CoralVue, Inc.
- That CoralVue be immediately notified in writing within ten (10) days of first knowledge of defect by owner or his agent.
- That CoralVue, Inc. shall be given first opportunity to make any repairs, replacements or corrections to the defective construction within a reasonable period of time.
- Under no circumstances shall CoralVue and/or the Manufacturer be liable by virtue of this warranty or otherwise for damage to any person or property whatsoever for any special, indirect, secondary or consequential damages of any nature however arising out of the use or inability to use because of the product defect.
Instructions:
- Carefully unpack the IC-AIO20G tank on a completely flat surface, checking that all three rear chambers are clear of cardboard shipping packing.
- Slide the included return pump line over the barb fitting on the pre-installed back plumbing bulkhead wall, seating the pump flat against the bottom floor of Chamber 3.
- Drop the 200-micron mechanical mesh filter sock straight into the circular cutout ring inside Chamber 1 directly under the main overflow surface skim teeth.
- Position the aquarium in its final location on a dedicated, level, aquarium-rated cabinet stand or counter. Warning: Glass aquariums filled with water weigh over 180 lbs and must never be placed on generic home desks or dressers.
- Fill the display section with your prepared sand, rock layouts, and mixed water until the water line overflows back into the rear chambers and settles halfway up the pump room glass wall.
- If adding an internal skimmer or submersible heater, place them in the middle reaction chamber.
- Create a safety drip loop with the pump’s power cord outside the stand, plug the line into a grounded GFCI wall outlet, and monitor the rear chambers for smooth, bubble-free water transit.
- Always Use the Included Leveling Base Mat. Rimless aquariums distribute water weight directly through the flat bottom glass panel rather than through a molded plastic perimeter frame. Always position the tank on top of the included EVA foam leveling mat to absorb surface irregularities and prevent point-pressure stress cracks.
- Position the Return Nozzle to Break Surface Tension. To maximize gas exchange and prevent an oily surface film from forming in sumpless nano systems, point the directional flare nozzle slightly upward toward the water line. This creates active surface ripple while maintaining steady undertow current across the lower rockwork.