Substrate for Selective Plant Growth

[tonysss]

Hey guys,

I had a question regarding substrate choice. I've seen multiple types of substrate in tanks that limits the growth of plants to certain areas and provides a nice open field for view in the center. I've seen it usually consist of potting mix and fluorite for the plant growth part, and sand for the non-plant part as seen in this video:

. Is my guess correct for the actual substrate choices?

Thanks,

 

[Mebbid]

Plants will grow just fine in sand. You can use plastic dividers to keep runners from growing under the soil or just keep them trimmed enough that it won't matter.