How come you only see Cichlids with other cichlids and not other fish? Well I haven't anyway ?
That's kind of a broad, false assumption. What you're seeing, at least what I assume you're seeing, are AFRICAN cichlid tanks. Which are indeed mostly cichlids with the exception of schooling fish or catfish. Those tanks are kept as only cichlid tanks as all those fish come from parts of Africa where a majority of the fish are Cichlids. However though, african cichlids are NOT the only cichlids in the world and other cichlids, including africans, are kept with other fish.
For example I have two Apistogramma trifasciata, which are cichlids, who live in a 10 gallon with my 9 Dwarf Pencilfish and my 2 Oto Catfish.
I hope that answered your question.
My 10 Gallon Aquarium Journal
10 Gallon Planted: 1x Apistogramma trifasciata, 8x Nannostomus marginatus
20 Gallon: 1x Mikrogeophagus ramirezi, 10x Nannostomus beckfordi, 3x Otocinclus vittatus
~Formerly known as Carapar56~
It depends on the cichlid.
If you're talking africans, you don't want to mix them with anything but africans because they are such aggressive fish. They will happily kill more peaceful fish or even some of their own. That's why african cichlid tanks are generally over stocked - more fish spread the aggression around and keeps them from focusing on one fish that might end up dead.
South American cichlids, on the other hand CAN be kept with other species (but never with Africans) under certain circumstances - again it depends on the aggression of the cichlid in question.
Angels, for instance can be kept individually in a tank with, say severums or geophagus, but if you add more angels, you'll likely to have angels fighting angels unless you get a breeding pair. That breeding pair, however, might aggressively defend their territory and harm another cichlid during spawning.
I personally keep severums, geos and blood parrots together with larger tetras and they get along fine. That's because generally speaking sevs and geos and BPs are the least aggressive cichlids.
Those are just some examples.
If you have specific questions about what cichlids can co-exist peacefully, please ask and someone here will e glad to help out.
30 g FW planted:corys, ABNP, blue angel, harleys, zebra danios, nerites & mystery snails
15 g FW planted: crown tail betta, neons, snails
90 g FW semi planted: Blood Parrots, severum, Jurupari, EBJD, congos, kribs, clown pleco, snails
90 Gal Journal: http://www.aquaticcommunity.com/aqua...ad.php?t=93939
Fishless cycling: http://www.aquaticcommunity.com/aqua...ead.php?t=5640
Cycling with fish: http://www.aquaticcommunity.com/aqua...ad.php?t=36492