10-31-2010, 04:39 PM
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Your options are somewhat limited by the water parameters, plus the tank size; 120 litres is 32 gallons, so I will assume a 3-foot tank similar to my 33g.
Dwarf cichlids would suit this tank, though the species will be limited by the water parameters. Many of the dwarfs in the Apistogramma genus absolutely require soft, acidic water as they will be wild caught fish, unless you can find a breeder in your area who might have acclimated them to harder water. There are some Apistogramma species that manage in basic (pH 7 and up) medium hard water, so that's one option. Some species do best as a harem, one male and 2-3 females; if you acquire very young fish, a group of 5 would work, and one of the males will become dominant and the other males will appear as females (except they won't lay eggs). If the dominant male should leave the tank, one of those subordinate males takes over. This is quite an interesting facet of these fish. I had a group of A. bitaeniata (they were known as A. kleii back then) some years ago, bought five, assumed one male and 4 females as they matured, then when the male died a year later suddenly one of the assumed "females" grew extended fins and took over. Point of this is that a small group in a 33g will work if they are very young when you get them. Another cichlid is the Bolivian Ram, cousin to the common (blue) ram but much less demanding, and suitable in basic water. A pair in a 33g would work; this is not easy though, as the males only develop the extended fins with some maturing and most often stores have tanks of very young fish.
Plants suit any of the above, with normal tropical temperatures. Compatible fish are many, from Corydoras and other catfish to characins (tetra) and cyprinids. Just check the water parameter needs as many are adaptable but some are not.
Last edited by Byron; 10-31-2010 at 04:47 PM..