Tideline Crystaline G2 Reef External 36x20 (65 Gallon)

Tideline Crystaline G2 Reef External 36x20 (65 Gallon) is a complete rimless reef-ready system: a low-iron crystal display tank plumbed with Tideline's Ultra-Slim External Overflow, a matching glass refugium sump, and a fully-assembled, USA-made cabinet stand. The external overflow keeps the inside of the display completely open and clean, with no internal overflow box eating into your aquascape. Prefer the overflow tucked inside the tank? See the Crystaline G2 Reef Internal 36x20. Just want a display tank with no plumbing? The Show Kit 36x20 is the option. Browse all aquarium systems.

What's in the Package

• Display tank: 65-gallon rimless aquarium, 36 in x 20 in x 21 in, low-iron crystal front and side panels with beveled edges, drilled for external plumbing.
• Ultra-Slim External Overflow: mounts on the back of the tank for a whisper-quiet, silt-free surface skim while keeping the display interior wide open.
• Tideline Crystal Glass Refugium Sump: newly-designed low-iron glass sump with a built-in refugium section for filtration, chemical media, and macroalgae.
• Fully-assembled stand: 36 in tall cabinet, pre-painted or stained in your chosen finish, side-access doors on both sides, controller-ready. No assembly required.

Built for Reef

• Low-iron crystal glass: ultra-clear tank and sump show true coral color with none of the green tint of standard glass.
• External overflow: keeps the display interior open and clutter-free, with a clean, quiet surface skim.
• Refugium sump: room for a skimmer, return pump, heater, media, and a lit refugium to grow macroalgae and pods.
• Controller-ready: the stand is set up to accept an optional controller board or a full Hydros build.
• USA-made stand: the 36 in tall stand is fully assembled and built here in the USA, with dual side doors for easy equipment access.

Specifications

Choose Your Finish

The Crystaline G2 stand is offered in 13 cabinet finishes: Black, White, Carbon, Cognac, Frost, Grey, Mahogany, Medium Oak, Sahara, Cherry, Mocha, Spanish Oak, and Unfinished. Pick your finish from the drop-down above. Selecting a finish shows its matching render.

Package Options

Take the build further, all by special order:

• Controller-Ready: add a controller board to the stand.
• Deluxe HYDROS-equipped: go all-out with a fully Hydros-controlled setup for automated pumps, monitoring, and safety.

The kit includes the tank, external overflow, sump, and stand. A return pump, protein skimmer, heater, and light are not included, so you can spec the gear you prefer. Ask us and we will put a full package together.

Recommended Pairings

• Kessil AP9X: premium reef LED to light the rimless display.
• CaribSea Ocean Direct: live marine sand to start the reef.
• Salt mixes: mix up saltwater for fills and water changes.
• Seachem HydroTote: haul RO/DI and saltwater for pickup and top-off.
• All aquarium systems: compare other Tideline sizes and configurations.

FAQ

How is this different from the Reef Internal?
Both are complete reef systems with the same tank, refugium sump, and stand. This External version uses the Ultra-Slim External Overflow mounted on the back of the tank, so the inside of the display stays completely open with no internal overflow box. The Reef Internal uses a traditional internal overflow box in a back corner.

How big is the whole setup?
The display tank is 36 in x 20 in x 21 in and holds 65 gallons (the sump adds more total water volume). The stand is 36 in tall, putting the rim at roughly 57 in off the floor.

Does it come with a pump, skimmer, or light?
No. The kit is the tank, external overflow, refugium sump, and stand. Add the return pump, skimmer, heater, and light you prefer, or ask us to spec a complete package.

Do I have to build the stand?
No. Every Crystaline G2 stand ships fully assembled and pre-finished. No flat-pack, no assembly.

Can I get a specific finish?
Yes, all 13 finishes are available. Because each unit is built to order, choose your finish at checkout and we will confirm the lead time.