Tideline Crystaline G2 Reef Internal 48x20 (87 Gallon)

Tideline Crystaline G2 Reef Internal 48x20 (87 Gallon) is a complete rimless reef-ready system in a wide 48 in format that gives you generous swimming length and room to aquascape. It pairs an 87-gallon low-iron crystal display tank with a traditional internal overflow, a matching glass refugium sump, and a fully-assembled, USA-made cabinet stand. The internal overflow tucks into a back corner for simple, reliable plumbing. Want the overflow off the back glass instead? See the Crystaline G2 Reef External 48x20. Prefer a plain display tank with no plumbing? The Show Kit 48x20 is the option. Also available deeper: the 48x24 Internal Kit, or in a 36 in footprint, the Reef Internal 36x20.

What’s in the Package

• Display tank: 87-gallon rimless aquarium, 48 in x 20 in x 21 in, low-iron crystal front and side panels with beveled edges, drilled for the internal overflow.
• Internal overflow: a low-profile overflow box in a back corner delivers a quiet, silt-free surface skim down to the sump.
• Tideline Crystal Glass Refugium Sump: newly-designed low-iron glass sump with a built-in refugium section for filtration, 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.
• Wide 48 in format: the long footprint gives fish more swimming room and opens up dramatic aquascapes.
• 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:

• External overflow: swap the internal box for Tideline's Ultra-Slim External Overflow.
• 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, internal 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 External?
Both are complete reef systems with the same 87-gallon tank, refugium sump, and stand. This Internal version uses a traditional overflow box inside a back corner of the display. The External version uses the Ultra-Slim External Overflow mounted on the back glass, leaving the inside of the tank completely open.

How big is the whole setup?
The display tank is 48 in x 20 in x 21 in and holds 87 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, internal 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.