Oh cool, yeh I just found out about the SA Puffers. Could be interesting, but I am really not a fan. Plus the teeth problem, sounds like their specialist diet would be something difficult to cope with.
Spacefish: Of coarse it can be risky to use wild things in your aquarium, but if you know the source is safe and clean, and you clean the materials, and you run some tests, then I see no problem with it at all, and far prefer it, as it brings in natural minerals from the gravel and natural tannin from the wood. If you want to try and replicate something real, then imo there is no substitute for REAL real.
I am lucky that my local natural clean streams and rivers are exactly the same pH and water softness as the Amazon, the only difference is it is freakin cold here. So when this stuff is added to a tropical aquarium which heats it up, any bio-logical nasties that lived in the cold water will die off and be replaced by the aquarium biological conditions I create.
And how can you trust aquarium treated wood and gravel anyway. You don't know what they have done to it. I would trust companies like ADA but not many others with that sort of stuff.