A 100-gallon fish tank typically measures 72 inches long, 18 inches wide, and 20 inches high.
A standard 100-gallon aquarium has dimensions of 72" x 18" x 20" (L x W x H), though exact measurements vary by manufacturer. These tanks weigh approximately 180 pounds empty and 900 pounds when filled with water, requiring sturdy stands and proper floor support.
Common 100-gallon tank dimensions comparison
| Brand/Model | Length | Width | Height |
|---|---|---|---|
| Standard rectangular | 72" | 18" | 20" |
| Extra-tall | 60" | 18" | 24" |
| Show tank | 72" | 24" | 16" |
Setup considerations for 100-gallon tanks
- Floor support: Must support 900+ pounds when filled
- Equipment: Requires 200-300W heater, 300-500 GPH filter
- Space needed: Allow 6-12 inches clearance on all sides
- Stand dimensions: Typically 72" x 18" x 30-36" tall
Popular fish for 100-gallon aquariums
- Cichlids: 10-15 medium-sized African or South American species
- Community fish: Schools of tetras, barbs, or rainbowfish
- Large species: Single Oscar, discus group, or small predator fish
- Marine options: Small reef setup with clownfish, gobies, and corals