09-19-2009, 01:31 PM
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It all depends upon the fish you want.
The size of tank must be adequate for a group of the particular fish, both the type of fish, their adult size, and ow many you want in the group. Generally a longer rather than a higher tank is preferred, as this provides more swimming room and greater surface area.
As for the decor, which includes the type of substrate (sand, gravel, rocky pebble), wood and/or rocks, and plants, it depends upon whether you want a true biotope or a geographic setup.
A biotope is strictly speaking a replica of the particular stream or lake where the fish originate. The fish and plants (if any, and many biotopes have no plants) would only be those species that could be found living together in that particular stream or river or lake, and the wood or rocks would be used if these are found in the natural habitat.
A geographic setup is one in which all the fish and plants are native to the same geographic area, and the wood/rocks would be found there. I have this type of aquaria, a 115g Amazonian riverscape, a 90g flooded Amazonian forest, and a 70g SE Asian swamp/stream. The specific plants and fish do not have to be found together in the same stream in this type of setup, but they would all occur in the same geographic area.