How to Specify a Custom Aquarium: A Guide for Interior Designers

Specifying a custom aquarium for a high-end residential or commercial interior is unlike sourcing almost any other design element. Done well, it becomes the defining feature of the space — a living sculpture that commands attention, creates atmosphere, and elevates the entire project. Done poorly, it creates ongoing maintenance headaches, structural complications, and disappointed clients.

At Okeanos Group, we have been designing and installing custom aquariums for interior designers since 2002. Over more than two decades, we have worked on projects across New York, Los Angeles, Miami, London, and the Middle East — from intimate residential installations to multi-thousand-gallon commercial centerpieces. This guide distills what we have learned into the practical knowledge designers need to specify confidently.

Start With Structure, Not Aesthetics

The most common mistake designers make is treating the aquarium as a finish selection — something to specify late in the design development phase, like tile or hardware. A custom aquarium is infrastructure. It needs to be introduced into the design process during schematic design, not during construction documents.

Why? Because a properly specified aquarium requires structural consideration (water is 8.34 lbs per gallon — a 300-gallon tank weighs over 2,500 lbs), mechanical coordination (life support equipment requires dedicated space, drainage, and often a chiller), and millwork integration that must be designed in parallel with cabinetry, not as an afterthought.

When you engage Okeanos early in a project, we provide your structural engineer with load specifications, your MEP consultant with equipment footprints and utility requirements, and your millwork team with detailed shop drawing coordination. This is what separates a seamless installation from one that causes problems on site.

Understanding the System Behind the Glass

What clients see is a pristine panel of glass and the life within it. What makes that possible is a sophisticated life-support system that must live somewhere — typically inside a dedicated equipment cabinet, an adjacent mechanical room, or a below-grade sump space.

Every Okeanos installation includes:

• Filtration system — biological, mechanical, and chemical filtration sized to the tank volume and livestock load
• Circulation and flow — return pumps and powerheads designed for the specific aquascape
• Lighting — LED systems tuned for coral growth, fish display, or pure aesthetics depending on the biotope
• Temperature control — heaters and chillers as required by the species and environment
• Automated top-off — maintains water level as evaporation occurs

For designers, the key specification decision is where this equipment lives and how access is maintained. We work with millwork teams to design service doors, removable panels, and maintenance corridors that keep the back-of-house invisible without compromising access for our technicians.

Choosing the Right Biotope

The most important design decision after scale is the biotope — the type of aquatic environment you are recreating. This determines everything: livestock, aquascape, lighting, and long-term maintenance requirements.

Reef aquarium — Living coral reef with vibrant fish and invertebrates. The most visually spectacular option, and the most technically demanding. Ideal for clients who want maximum visual impact and are committed to a full-service maintenance program.

FOWLR (Fish Only With Live Rock) — Dramatic fish display without the complexity of coral husbandry. Lower maintenance, more forgiving water parameters, and still visually compelling. A strong choice for commercial environments and clients who prioritize reliability.

Freshwater biotope — Can range from a minimalist planted tank to a lush Amazonian riverscape. Lower technical complexity than marine systems and often a better fit for environments where maintenance access is limited.

What to Include in Your Specification

• Tank dimensions and structural load calculations
• Equipment room or sump dimensions and utility requirements
• Electrical load schedule (dedicated circuits required)
• Plumbing rough-in locations (drain and supply)
• Millwork coordination drawings for cabinetry integration
• Lighting specification for ceiling coordination (pendant or recessed)

Ongoing Maintenance: The Specification That Clients Forget

A custom aquarium is not a static installation — it is a living ecosystem that requires expert care. When specifying an aquarium for a client, the maintenance program is as important as the tank itself. A stunning installation that becomes cloudy, green, or understocked within six months reflects on the designer as much as the installer.

Okeanos offers comprehensive maintenance programs for every installation we complete — bi-weekly or monthly visits, water chemistry management, glass cleaning, equipment servicing, and livestock health monitoring.

Working With Okeanos on Your Next Project

We work directly with interior designers and design firms as trade partners. To discuss your project or request our trade program details, contact us at okeanosgroup.com or call 212-244-9555.