I have been using one for 5 years already. Yup, seems not much discussions on it here. But seems to be going quite a good job in my biological filtration needs for my 100l tank. Basically mine is an over kill as it is rated enough for 700 litres. I can afford not to change water for over a month although I usually change it fornightly. But one thing I noticed is that my tank plants rarely bubble. Read that the bacterials in the FBF takes up a lot of oxygen. But my fish never show signs of low oxygen even thru the night.
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