Substrate for Polyphaga obscura / Polyphaga saussurei?

[Diabelskiii]

Hi, i got mine Polyphaga roaches and i've been wondering.. is mixture of :  coconut peat ,oak and beech ( leaf/wood)  substrate , oak/beech leaves,  a suitable substrate for them?

 

[kurgar galatur]

That's exactly how I keep my saussurei and aegyptiaca.

 

[Andy365]

That should be fine, I keep mine in pure coconut fiber with some dead leaves on top and they seem to do fine.