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20-Gallon Communities

Listing of suggested freshwater communities for a 20 gallon aquarium.

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20 gallon
6 zebra danios
6 lemon tetras
3 platies
3 bronze cories
1 pygmy sucker catfish (Otocinclus)

20 gallon
6 marbled hatchetfish
10 cardinal tetras
1 red-tailed shark

20 gallon

10 glow light tetras
6 platies
1 pygmy sucker catfish (Otocinclus)
3 bronze cories

20 Gallon Community- Bronze Cory
Bronze Cory
20 Gallon Community- Cardinal Tetra
Cardinal Tetra
20 Gallon Community- Otocinclus
20 Gallon Community- Glowlight Tetra
Glowlight Tetra

20 Gallon Community- Lemon Tetra
Lemon Tetra

20 Gallon Community- Marbled Hatchetfish
Marbled Hatchetfish
20 Gallon Community- Platy
20 Gallon Community- Zebra Danio
Zebra Danio
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20-Gallon Communities

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Reader Comments

Elyott    Elsweyr, NM

10/16/2013 9:39:39 AM

As helpful as this is, your recommended numbers for certain social species, such as Cory cats and Otocinculus are irreconcilable with the detailed fish information posted elsewhere on your site. For example, it is recommended to stock one Oto cat when the species description states clearly that they prefer to be in groups of six or more. Perhaps if these discrepancies were adjusted this page would provide more useful information.

terry    madison, WI

6/15/2013 12:55:44 PM

All those options are over loading

Freddy P    Waipahu, HI

4/3/2013 8:11:23 AM

I have an angelfish with large zebra danios. No problems with them. With regard to the otocinclus, make sure that they get some fresh vegetables a few times a week in addition to any algae/spirulina tablets you may use. I add a slice of cucumber speared with a fork so the cucumber is at the bottom. They also need super clean water.

Taryn    Ajax, CA

4/2/2013 6:31:06 PM

I want to know if I can put a angel fish with very fast zebra danio ? Plus I'm getting otocinclus

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