In my 30 gallon tank:
4 Boeseman's rainbowfish
3 green swordtails
2 corydoras catfish
5 otocinclus catfish
1 yo yo loach
1 clown pleco
In my 20 gallon tank
2 pearl gouramis
>9 red wag platies
1 corydoras catfish
1 yo yo loach
Plants (in both): java fern, java moss
http://pages.prodigy.net/ptrow/fish/big_aquarium.htm
4 Boeseman's rainbowfish
3 green swordtails
2 corydoras catfish
5 otocinclus catfish
1 yo yo loach
1 clown pleco
In my 20 gallon tank
2 pearl gouramis
>9 red wag platies
1 corydoras catfish
1 yo yo loach
Plants (in both): java fern, java moss
http://pages.prodigy.net/ptrow/fish/big_aquarium.htm