Also, if you go the AGA contest website and look at the biotopes, then look at the tanks that mimic south american stuff, they all used oak leaves. That's the only reason I suggested that. I didn't see any that used IAL. I'm not saying you can't, but I wouldn't do it, simply because I want you to win. lol
Here is the link to the website
http://showcase.aquatic-gardeners.org/2011.cgi