Care for most of the larger species of dart frogs is very similar so there are few care sheets about specific species available. There are many good sites with general information though:
http://www.thebdg.org/
http://www.doylesdartden.com/
http://www.saurian.net/htm/dartfrogs1.htm
http://www.tropical-experience.nl/articles.php?menu=4
http://www.amphibiancare.com/frogs/caresheets/poisondartfrog.html
I would advise keeping dart frogs and geckos seperate, particularly if these are your first dart frogs. When there is more than one species in a cage it increases the amount of problems that can occur, something you certainly want to avoid. For more information about mixing species you may want to have a look at http://www.amphibiancare.com/frogs/articles/communitytank.html Also, if you haven't already, you might want to try posting this in the arrow frog forum, you'll probably recieve more responses. Good luck,
-----
Devin Edmonds
devin@amphibiancare.com
www.amphibiancare.com