I kno this threads has prob already been beat to death but like other people expirence & opnions with Bio-Media... lookin for Bio-Media to go into my 350Gal Sump for my 800Gal indoor pond almost ready for fishless cycling w/ media from a cycled tanked already... what is the perfered Bio-Media that everyone is using with great results??? I was leaning toward SeaChems Pond Matrix, then Bio-Glass next in-line, not really worried about Nitrates & WC's due to using 8 Stage RO/DI System for a Continous WC in the sump have an over-flow in the same chamber as the return pump for excess water to exit from the sump & tank... just looking for a Bio-Media that will provide massive ammount of BB in the sump have 4 Catfish over 3ft goining into this Pond so need really good amount of BB for these Big Cats... any reccomendation on a product that does such requirements on the amount of quanity of BB please fell free to post the Brand and where u purchased it..