01-26-2012, 08:04 AM
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8g will really have something less, more like 6.5 or 7g or so because of substrate, decorations, and not filling the tank to the brim.
The "ballpark" is 1" per gallon, but that's only a ballpark. You have to closely monitor the water parameters to make sure everything is okay.
4-8 cherry barbs and two bettas is way too many for that little water. Since the majority of fish used in aquariums are schooling fish, you are most likely only going to be able to do a single species tank. The two bettas alone are close to the 'ballpark' limit. You'll need to find a small non-schooling fish if you want anything else, or go for invertebrates like snails and shrimp.
Water from an established tank will not provide much benefit. A little, but not much. It's better to place filter media from an established tank into a new tank.
Last edited by Geomancer; 01-26-2012 at 08:07 AM..