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Saltwater 20-Gallon Communities

Listing of suggested saltwater communities for a 20-gallon aquarium.

Tank Size Beginner Moderate Advanced
20-gal:
live rock marine fish aquarium

FISH
1 – snowflake moray
(Echidna nebulosa)
 
INVERTS
10 – Astraea snails

FISH
1 painted frogfish
(Antennarius pictus)

INVERTS
2 - serpent stars
8 – dwarf hermit crabs

4 – tank-raised seahorses
(Hippocampus spp.)

INVERTS
8 – dwarf hermit crabs
2- skunk cleaner shrimp
(Lysmata amboinensis)
1 – Red seastar
(Fromia milleporella)

Snowflake  Moray 
Frogfish
Seahorse 

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Saltwater 20-Gallon Communities
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Reader Comments
If you keep Morays they WILL escape and if somebody isn't there to put them back in the the tank you'll find them dead on the floor leaving that begginer aquarist thinking maybe aquariums aren't so fun anymore.
Collin, San Ramon, CA
Posted: 2/10/2010 7:57:38 PM
In response to an earlier comment: If one were to add Dwarf seahorses to a 20-gallon, you would need a lot more than 4. They are very gregarious and need a high density of live food. I would NEVER put hermit crabs or shrimp in with them, but I've had no trouble with Fromias. A small, but not Dwarf, seahorse might be a good fit for this tank, i.e. breviceps, capensis. A 20-high would still be preferred over 20-long, though.
Kaitlyn, South Portland, ME
Posted: 4/15/2009 11:15:37 AM
I would like to see a more diverse assortment of community set ups for all the tank sizes so that the new aquarist can really explore their options further than only two or three options, because there are obviously thousands of options one might take. I really don't find this section as helpful as it could be.
Eric, Englewood, CO
Posted: 8/26/2008 10:04:34 PM
I did not find the 20 gallon list very helpful. Surely, one can have more then just one fish in a beginner 20 gallon tank.
Lee, Tulsa, OK
Posted: 3/22/2008 2:12:11 PM
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