(I didn't put this in the cichlids forum b/c it involves cichlids from several different places, but mods, if you think it should be moved, feel free. 
)
Alright, this is my full list of cichlids that can go in a 20-30g tank... I've had this list for a while and I just wanted to make sure that it was accurate. Let me know of any suggestions, comments, etc. so I can improve this list... if you want to add a fish, than include it's level of aggression, origin and min. tank size. Thanks!
Biotope Key:
Pink= Congo/ Congo Basin
Orange= Amazon/ Amazon Basin
Amazon Rain forest acid pool= gold
South America= grey
Peru= lavender
Lake Tang. = sea green
Lake Victoria = Red
Guyana/ Western Guyana= Plum
Western Africa= Brown
Only One per Biotope= Black
Mexico= indigo
Central America= aqua
Southeastern Africa= cyan hap
Temperament Key:
** = Beware
** = Peaceful
**= aggressive
20g Cichlid Options:
African Butterfly Cichlid**
Agassiz's Dwarf Cichlid**
Banded Dwarf Cichlid**
Blockhead Cichlid**
Borelli's Dwarf Cichlid**
Boulenger's Cichlid**
Brichard's Slender Cichlid**
Brichardi Cichlid**
Cockatoo Dwarf Cichlid**
Dickfeld's Julie**
Egyptian Mouthbrooder**
Fairy Cichlid**
Golden Dwarf Cichlid**
Keyhole Cichlid**
Kribensis**
Lemon Cichlid**
Macmaster's Dwarf Cichlid**
Masked Julie**
Multifasciatus Dwarf Cichlid**
Nichols' Mouthbrooder**
Ocellated Lamprologus**
Orange Chromide**
Panda Dwarf Cichlid**
Plain Goby Cichlid**
Ram Cichlid**
Redbreast Acara**
Roloff's Kribensis**
Speciosus Cichlid**
Steindachner's Dwarf Cichlid**
Striped Goby Cichlid**
Temporalis Cichlid**
Toae Cichlid**
Three-Striped Dwarf Cichlid**
Two-Banded Cichlid**
Checkerboard Cichlid**
Brownae Hap**
Nudiceps Cichlid
21-30 Gallon Options:
Black-Fin Cichlid**
Blue-Eye Cichlid**
Brichard's Chalinochromis**
Burton's Mouthbreeder**
Callolepis Cichlid**
Cupid Cichlid**
Cutter's Cichlid**
Cyan Hap**
Flag Cichlid**
Golden/Ornate Julie**
Obliquidens Hap**
Tretocephalus Cichlid**
White-Spotted Tropheus**
Yellow Kribensis**
Angelfish**
Blue Flash**
Blunt-Head Cichlid**
Convict Cichlid**
Four-Spine Cichlid**
Guenther's Cichlid**
Jewel Cichlid**
Leopold's Angelfish**
Leptosoma Cichlid**
Lifalili Jewel Cichlid**
Marlier's Julie**
Pasionis Cichlid**
Port Acara**
Rainbow Cichlid**
Regan's Julie**
Sajica Cichlid**
)Alright, this is my full list of cichlids that can go in a 20-30g tank... I've had this list for a while and I just wanted to make sure that it was accurate. Let me know of any suggestions, comments, etc. so I can improve this list... if you want to add a fish, than include it's level of aggression, origin and min. tank size. Thanks!
Biotope Key:
Pink= Congo/ Congo Basin
Orange= Amazon/ Amazon Basin
Amazon Rain forest acid pool= gold
South America= grey
Peru= lavender
Lake Tang. = sea green
Lake Victoria = Red
Guyana/ Western Guyana= Plum
Western Africa= Brown
Only One per Biotope= Black
Mexico= indigo
Central America= aqua
Southeastern Africa= cyan hap
Temperament Key:
** = Beware
** = Peaceful
**= aggressive
20g Cichlid Options:
African Butterfly Cichlid**
Agassiz's Dwarf Cichlid**
Banded Dwarf Cichlid**
Blockhead Cichlid**
Borelli's Dwarf Cichlid**
Boulenger's Cichlid**
Brichard's Slender Cichlid**
Brichardi Cichlid**
Cockatoo Dwarf Cichlid**
Dickfeld's Julie**
Egyptian Mouthbrooder**
Fairy Cichlid**
Golden Dwarf Cichlid**
Keyhole Cichlid**
Kribensis**
Lemon Cichlid**
Macmaster's Dwarf Cichlid**
Masked Julie**
Multifasciatus Dwarf Cichlid**
Nichols' Mouthbrooder**
Ocellated Lamprologus**
Orange Chromide**
Panda Dwarf Cichlid**
Plain Goby Cichlid**
Ram Cichlid**
Redbreast Acara**
Roloff's Kribensis**
Speciosus Cichlid**
Steindachner's Dwarf Cichlid**
Striped Goby Cichlid**
Temporalis Cichlid**
Toae Cichlid**
Three-Striped Dwarf Cichlid**
Two-Banded Cichlid**
Checkerboard Cichlid**
Brownae Hap**
Nudiceps Cichlid
21-30 Gallon Options:
Black-Fin Cichlid**
Blue-Eye Cichlid**
Brichard's Chalinochromis**
Burton's Mouthbreeder**
Callolepis Cichlid**
Cupid Cichlid**
Cutter's Cichlid**
Cyan Hap**
Flag Cichlid**
Golden/Ornate Julie**
Obliquidens Hap**
Tretocephalus Cichlid**
White-Spotted Tropheus**
Yellow Kribensis**
Angelfish**
Blue Flash**
Blunt-Head Cichlid**
Convict Cichlid**
Four-Spine Cichlid**
Guenther's Cichlid**
Jewel Cichlid**
Leopold's Angelfish**
Leptosoma Cichlid**
Lifalili Jewel Cichlid**
Marlier's Julie**
Pasionis Cichlid**
Port Acara**
Rainbow Cichlid**
Regan's Julie**
Sajica Cichlid**
and then I'm just switching a few and adding/removing a couple more (then I'll re-post the list).