amazon biotope

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As far as piranhas go, you could probably go with Serrasalmus Rhombeus "Black Piranha" but do keep in mind they need to be kept alone. If you can get past the whole needing to have more than one fish thing, they are a perfect match for what you are doing they grow incredibly slow and require a large aqaurium when older. A 4"-5" specimen would be ok in a 55g for quite a while. Estimated mature size is around 19"-24" biggest I've seen in captivity was around 17" single piranhas do tend to get a little boring after a while, but given the circumstances you're pretty limited in your choices. Most of the fish that will be fine in a 200g - 300g won't do very well in a 55g, not even as a juvenile specimen.
 
Howdy,

Being dead serious about a biotope tank, there is only one way: Scientific Literature, such as:

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I have this book, it lists plants, fish, inverts, whatever you ever wanted to know about these specific stretches of river.

If you want to be more general and allow a few exceptions, then a few of us can help. I have a piranha tank with a South American emphasis. The only non-South American species in my tank are two plant species (Anubias and Crinum) and three invertebrate species (red cherry shrimp, red crabs, and Malaysian trumpet snails). Besides that, I have only South American species. This is 220 gal.

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HarleyK
 
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