06-11-2008, 02:35 AM
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For the cherry barbs, it's best to do a ratio of 1 male to two females, so three or six fish would be good.
Any of the rasboras, danios, white clouds or tetras I mentioned, as well as the pygmy cories, are all schooling fish that would prefer to be in groups of at least six.
For the gouramis, you could get one dwarf gourami, two honey gouramis, or probably three sparkling gouramis.
Again, if you got a dwarf cichlid of some kind, it would be best just to keep a single fish. This applies to the betta as well, although you might be able to put several female bettas in an 8g tank as long as you made sure there are plenty of hiding spaces.
The livebearers will breed if you mix the sexes, and to reduce stress you will want a ratio of one male to two females. If you do this, though, you WILL get fry. If you want to avoid the problems of having more fry than you can handle, get all males. You could fit five or six guppies or 3-4 platies in an 8g.
I forgot to mention...an 8g tank is probably big enough to also house a mystery snail or some other type of snail or some shrimp to help with your cleanup crew.