04-03-2010, 07:39 PM
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Following through this thread, I gather you want some sort of "centrepiece" fish plus the smaller shoaling (schooling) fish like a tetra, and obviously the bottom fish being a small pleco and shrimp.
If that surmise is accurate, and if your water is at pH 6 out of the tap, you have almost endless possibilities. Livebearers were mentioned along the way, they are not suitable for acidic soft water. But among the soft acidic water fish...
A pair of dwarf cichlids would suit a 20g with a piece of wood and well-planted, along with a group of two of the smallish characins (tetras, hatchetfish, pencilfish) or rasbora; the small species pleco and shrimp, or a group of one of the dwarf species of Corydoras or even a trio of the average-sized corys for the bottom level. It is good to have fish that prefer different levels so the activity is spaced throughout the tank rather than all the fish being mid-level.