Just bout a BaquaPure Pool/Sand Filter Combo with pump & wanted to kno if the Sand(PFS) as Media would be better to use for Biological Filtration For my 2500 indoor pond or should i use the Xtra Xtreme Bio-Filter (plastic)Media that i have left over from my Xtreme ST1600 Bio Filter.. Pond is Gonna Hold 6 Big Cats all over 24"s, 4 Tigerfish all over 14", 3 PBass10-14", 2 14" Royal Clownknifes if anyone was interested in Bio Load...