Freshwater aquarium setup plans
The gallon label is one part of a setup. Footprint, water depth, mounting and service access change the equipment plan.
10 gallon
20¼ × 10½ × 12 9/16 in external example
A compact footprint with limited internal and rim space.
20 gallon long
30¼ × 12½ × 12¾ in external example
A long, shallow format with useful room across the front.
29 gallon
30¼ × 12½ × 18¾ in external example
The 20-long footprint with a taller water column.
40 gallon breeder
36 3/16 × 18¼ × 16 15/16 in external example
A broad front-to-back footprint that changes layout and lighting coverage.
55 gallon
48¼ × 12¾ × 21 in external example
A four-foot format with a relatively narrow footprint.
75 gallon
48½ × 18½ × 21⅛ in external example
A larger four-foot tank with substantially more front-to-back depth.
Dimensions use named Aqueon standard-tank examples. Verify the exact model before purchase. Tank size does not establish stocking suitability.