A question that always turns up is, 'how many fish should I have in a tank?' The general rule of thumb is 1 cm of fish per litre of water. That means for a 80 litre tank, you should aim for 16 or so fish that are about 5cm in length. Make sure you are considering how large the fish will get after they grow up (and not just the size of the fish when you buy them!).
You'll also want to keep fish in small groups, as this is often how fish are in nature. You'll also want to check with a fish specialist (called an aquarist) to find out if there may be an incompatibilities with keeping the same fish species in a single tank. They make attack each other if you're not careful.
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