[gregor]

Hi,

I purchased the following filter second hand:

http://www.thatpetplace.com/eheim-ec...r-media-60-gal

...and I'm missing the bottom layer of plastic(?) filtration media shaped like cylinders, and the layer of little rock looking things in the layer above that (biological?).

I think I've identified what they are:

Bottom cylinder layer:

http://www.thatpetplace.com/ehfimech-1l

Layer above that:

http://www.thatpetplace.com/ehfisubstrat-pro-1l

So my questions:

1. Do I have the right products?
2. Are there any cheaper alternatives that I can use to replace the official Eheim stuff? (hopefully)
3. In what amounts should I puchase for my particular filter?

The user manual is quite unhelpful for this matter. It assumed I already have this stuff and doesn't give any details.


Thanks!