Soil Substrate?

[This Old Spouse]

I've got a 55g with lots of plants and high light. Would it help the plants to put down a soil substrate under the sand? What are your experiences with this? And what's the best soil to use?

 

[techen]

I would just use pure soil, As the good stuff has trouble going through the sand and into the soil.

 

[Ps3Steveo]

John Innes no.3 is good.