i would say ehfisubstrat pro and then biomax ceramic rings.
mainly depends on your budget as well... eheim's ehfisubstrat has a higher price but if you really want more bioload you will go with eheim's product. quality vs. quantity
IMO
mainly depends on your budget as well... eheim's ehfisubstrat has a higher price but if you really want more bioload you will go with eheim's product. quality vs. quantity
