It is slightly different in marine tanks, mainly because you don't tend to have any higher plants to effectively deplete phosphorus, and the reef organisms are incredibly effective at scavenging any available phosphorus, mainly because they have evolved in an extremely phosphorus poor, oligotrophic habitat.
FWIW the Eheim Substrat Pro seems to work well - I often transfer some over from existing tanks to new setups and have never experienced any ammonia spikes in new or old tank (I just use Seachem Ammonium Alert so cant comment on any other nitrogen’s), closely observed fish behaviour shows no signs of any Ncylce disruption, nor does smell (I’m one of those people that insists tanks smell different depending on water parameters )
I’ve also always just purchased Eheim filter kits which include the various media (Eheim is a rarity in local and not so local shops - they’ve had no North American representative for years)
I’m much less impressed with the odd rectangular Substrat - though it’s shape works well in Eheim MiniUp filter
(unlike the Substrat Pro it’s too large to slip into the hole (in the plate) between media chamber and impeller)
The MECHpro is just annoying
(again it’s there as came with)