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Am a bit curious as to whether most doradids are found in whitewater areas or in blackwater, should I include peat in an aquarium with them?
hopefully there's no such thing as a stupid question so thanks for any feedback on this issue.

Depends on the species. Tell us what you have and we'll let you know if it's more suited to white- or blackwater.

I haven't actually set the tank up yet. I posted this because I didn't want to make any unnecesary mistakes when I do get the tank up and running. I was planning on getting hold of some spotted and striped raphaels. I've even thought about including an Anadorus grypus that the lfs had gotten ahold of but I don't know anything about that one exept its swedish name translates to roughly shadowy or cloudy talking catfish. Is it going grow too large for a 40 gallon tank if I do decide to rescue it from its unpleasant tankmates?

Spotted and striped raphaels are generally whitewater fish. The <i>Anadoras</i> will reach about 15-20 cm, so it'll only just fit in a 40-gallon.

Thanks for the feedback, I'll have to givesome serious thought as to whether or not I'll get the Anadorus.