http://forum.aqua-fish.net/ A forum devoted to aquarium fish, plants, techniques and fish keeping as a whole. en http://forum.aqua-fish.net/?topic=aggressive-aquarium-fish#1 Am about to launch a new fish tank but my experiences lack at this area. I have been keeping Guppies and Swordtails up until now so that I would like to start keeping some aggressive fish species too. I won’t mix Guppies with aggressive cichlids together, of course . The best I can get now is a list of fish which will be compatible and will get along somhow since I like community aquariums. I understand that I won’d be able to introduce 20 specimens into my new tank, however my idea is to put 4 fish together at least. African cichlids are prefered, however species coming from central america would be nice too. My new tank’s capacity will be 100 gallons. TY! Regina original post: April 3, 2007, 5:05 am anonymous 2008-05-02 http://forum.aqua-fish.net/?topic=aggressive-aquarium-fish#2 Hello Regina, I did some search in this database and found following fish which should satisfy your needs. . White lamprologus . African butterfly cichlid . Lyretail killifish . Blue lyretail . Red eyed characin . Aulonocara benga . Nyasa peacock . Grants peacock cichlid . African spotscale barb . Olivegreen ufipa barb . Longfin tetra . Guenther’s mouthbrooder . Red Fin . Spotted ctenopoma . Slender cichlid . Redchin panchax . Panchax . Sixbar panchax . Rostratus . Elephant nose . Brown julie . Striped julie . Masked julie . Electric yellow cichlid . Gold ocellatus . Brichard’s slender cichlid . Blunthead cichlid . Malawi shell dweller . Lionhead cichlid . Angel squeaker . Brichard’s synodontis . Featherfin catfish . Upside-down catfish . One Spot Squeaker . Ocellated synodontis . Roberts catfish . Congo tetra . Fairy cichlid . Guenthers notho . Blue Neon . Kribensis . Senegal bichir . Fenestratus Of course, there are catfish, but almost everz fish here is cichlid. I would keep Brown julie, Masked julie, Gold ocellatus and Nyasa peacock. They aren't aggressive, but I recommend them. Peter anonymous 2008-05-02