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Under ground filter or not?



Should I install an under ground filter.  Lots of opinions about no but
no reasons why. Leaning towards get one so tell me your experiences.
yes or no.  If no what filters should I use in addition to my Fluval 4 -

tank is a 50 gal.  Sand, which I like, or gravel.  If I don't use a UGF
I
am going to insert a layer of peat moss.