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hi i'm new well i'm getting a 20 long for x-mas i have already decided on 1 dwarf gourami and 8 harquliens what type of cory could i put in there.

Weclome to Planet Catfish. Before I get on to answer your question, could I please ask you to fill in the "Location" in the Profile at the top right corner of the screen - that way we can help you a little bit better than if we don't know where in the world you're from. You don't have to be very specific, but if you live in a big country (USA, Australia, etc), you may want to fill in some more than the country to help us get an idea of which corner of the country. Being more detailed can help others help you better (say for instance someone living nearby can recommend a good shop without having to ask about the more precise location first). It's also, by the way, part of the Rules for the forum...

As to which cory you could have is pretty much dependant on the temperature your want to keep the tank at (which of course is part dependant on what the other fishes want). So I looked up Dwarf Gourami (Colisa lalia) which should be kept around 25-28'C or so (depending on which web-site you believe in - http://www.fishbase.org lists 25-28'C). Fishbase lists 22-25'C for the Harlequin Rasbora Trigonostigma heteromorpha. Combining those gets 25'C.

A search for Corydoras in that likes 25'C lists 92 different species. Ordered by number of popularity, here.

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Mats