There are ways to run a successful fuge and unfortunately, it is out of reach for a lot of hobbyists, especially beginners. Most fuges are poorly set up and their users frequently parrot misinformation and never show pics of their so called success (to include the guy who flamed me). Like I said in my signature, never take advice from anyone who cannot produce a single pic of their tank.
I don't want to get into a discussion about the effectiveness of fuges and what it takes to use one properly. You can search that thread. The person who started this post does not seem to be in position to do so, so I advised something more in her reach that will have a far greater impact.