ok, well you learn something everyday! never knew that

In my eheim2213 i use Ehfi Fix and it works a treat,so easy to wash out !

On my large eheim eco i use Oase garden pond sponges with a coarse pre-filter sponge in the tank over the outlet ! the oase sponges come in sheets In 2 or 3 different textures(coarse medium and fine) this can be cut to fit any size filter.
my aim in doing this is to keep all bio-media free of crud/mulm !

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yeh good stuff this Ehfi Fix

Externals all the way i only use internals on my 2fts and along with a external on my ray tank. I love the FX5 can keep up with my bioload.

Its the mechanical filter media in this thread, not what filter u use !



so boggy what do you use in your externals as first stage filtering ?

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i have a tetratec ex 700 on my biggest at the mo an its pretty good at getting rid of all the cack

its one of the eternals with the most filter media and if i was going to buy another one it would be a tetratec

I currently use Ehfimech in all my canisters along with Ehfisubstrat, but have been hearing good things about EhfiFix and am seriously considering changing over to it.

I use EhfiMech on all my externals , but after reading up on EhfiFix as with others I'm certainly considering changing over.

I use more or less enterily alfagrog and ceramics and a sponge on top.