Just scored a used Eheim W/D 2229 off ebay (hopefully in good shape, listed as so) and am researching media.
So far I've found that a few people are mixing media types like the Eheim MECH ceramic rings into the first bin and then using the Eheim Substrate Pro for the other two. Is this a good idea? I might try this but am tempted to stick to the Substrate Pro or EHFISubstrate only; as Eheim recommends.
Its starting out on a 30gal but I will be upgrading to a 72gal Bow soon. Stocked with Malawi Mbuna Cichlids (5 males! need the bigger tank so I can actually keep a female around, probably still have to part with two males; 3-Auratus, 1- Kenyi, 1- Snow White).
What are your experiences with this filter? any tips???
What is the difference between the EHFIsubstrate and the Subsrtate Pro?
Is this device going to help me much with mechanical filtration (beyond the biowheel 350 already in place)?
Will I need another filter on the 72gal besides Penguin 350 bio-wheel and this canister??
Thank you for any info its much appreciated!

So far I've found that a few people are mixing media types like the Eheim MECH ceramic rings into the first bin and then using the Eheim Substrate Pro for the other two. Is this a good idea? I might try this but am tempted to stick to the Substrate Pro or EHFISubstrate only; as Eheim recommends.
Its starting out on a 30gal but I will be upgrading to a 72gal Bow soon. Stocked with Malawi Mbuna Cichlids (5 males! need the bigger tank so I can actually keep a female around, probably still have to part with two males; 3-Auratus, 1- Kenyi, 1- Snow White).
What are your experiences with this filter? any tips???
What is the difference between the EHFIsubstrate and the Subsrtate Pro?
Is this device going to help me much with mechanical filtration (beyond the biowheel 350 already in place)?
Will I need another filter on the 72gal besides Penguin 350 bio-wheel and this canister??
Thank you for any info its much appreciated!