How much media?

[bradleyheathhays]

Feeling like I should have been able to find this listed somewhere in the lit but so far I haven't. I've got two new Eheim 2078s which I think are also referred to as 700s and I'm trying to determine how much of the Mech and Substrat Eheim media I need to get for them. The manuals show the bottom tray to be filled with Mech and the other three to be filled with Substrat. Found a deal for 5 liters of mech for 80 bucks which seems like a good deal when compared to the by the liter price, and if I'll eventually use it then seems worth it. But if 5 liters is way too much then I'd rather save the money.

Any advice?

[talldutchie]

Two eheim 2078s... I'm a bit jealous. I think 5 liters may even be a bit on the low side. If I read eheim correctly those things have an 8 liter volume.