Someone on here recommended the Fluval to me when I was planning the purchase of my 75 gallon. It was the best advise! I adore my Fluval 304!! I keep the output faucet just slightly above the water line, because my giant danios love to frolic in the water stream as it comes in from overhead (Disclaimer: Make sure you have a canopy/top if you have Giant Danios and entice them to play on the surface! LOL
It's a wonderful filter that has not ever let me down. I was considering next year upgrading to the 404 and going without my biowheel, which causes me much aggravation.