于 2003-07-08 11:31 I'm in the process of setting up a new 40" FOT equipped with tailor-made filter (滴漏). I also plan to add some sands to the bottom of my tank for decoration purpose. Do you think that it's necessary to install the undergravel filter at the bottom of the tank? Is it okay not to install this filter if I'm not going to add too much sands to the tank? Please advise. Many thanks.