Best 75-gallon aquariums for mixed reef or large freshwater. Top picks across budget tiers, what livestock fits, what to avoid, dimensions, weight, and FAQ. Updated May 2026.
Drilled tank ready for sumped reef setup. Better aquascaping depth (18").
Standard rimmed 75g. Cheapest path to 75g volume.
Rimless premium reef tank. Show-quality clarity.
Premium turn-key reef setup with sump + plumbing. Industry standard.
Suitable:
Avoid:
Beyond the tank itself, you'll need:
Use the stocking calculator to verify your livestock plan, the weight calculator to confirm your floor can handle it, and the electricity calculator for ongoing operating cost.
Standard 75-gallon aquarium dimensions: 48"×18"×21". Filled weight ~750 lbs.
~750 lbs filled (tank + water + sand + rock). Standard residential floors support ~40 lb/sq ft live load - tanks of 75g+ should be placed over a load-bearing wall or perpendicular to floor joists.
Yes - small marine setups (FOWLR or nano reef) work in 20g+. The reef setup options for this size are documented on the 20g FOWLR setup guide.
Total 75-gallon build cost varies by tier: budget $450-900, mid $900-1875, premium $1875-3750+. Use the reef build calculator for detailed breakdown.
Browse the full aquarium-by-size buying guide for 11 other tank sizes. Or jump to the step-by-step setup guides, the stocking blueprints, or the calculator collection.