Please don't make me talk about the horrible search function. I absolutely hate the search engine, but when I say that out loud I feel so ungrateful for criticizing a forum that I don't pay a penny to support (I've actually never bought any Monster Aquaria stuff). However it is insane that this search engine, for some reason, does not seem to care that things are in quotes...you might as well not bother trying to search for a specific phrase or set of words, it's impossible.
Anyway I don't think it can improve - perhaps there is a way, but I don't think it would be free. All I can say is that you are soooo much better off using Google.com and searching for whatever you're looking for with site:aquariacentral.com after that.
http://www.google.com/advanced_search