15266 - Marina 20G LED Glass Aquarium Kit - 75 L (20 US gal)
Top Fin® Essentials Aquarium Starter Kit | fish Starter Kits | PetSmart
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Aqueon Standard Rectangular Aquarium Black Trim 20 Gal Long
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File:Ripley's Aquarium of Canada, Toronto, Ontario (29969189246).jpg - Wikipedia
Marineland 20 Gallon Tank High Black 24x12x16 SD-3 308463 047497102008
Tetra Aquarium Kit, 20 Gallon, with LED Hood, Whisper Filter, Heater and Décor : Amazon.ca: Pet Supplies
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Aquarium Filter Pump for 5 10 20 Gallon Tank Crystal 120GPH Biochemica – KOL PET
Friend has a 20 gallon tank with this softball of a goldfish. I can't seem to find a solid answer online for size recommendations because I'm not sure what kind he is.