I bought 6 of these HC "rocks". It is HC growing on lava rocks, looks exactly like the ones in this picture. I am adding them to the 46 gallon bowfront I am working on (there is another post on that). My question is, how well will this grow on my driftwood. I was going to strategically place a couple on some of the ledges and impressions on my wood. Will it take off and grow, or do the roots really need to substrate to grow into ?
![](http://i237.photobucket.com/albums/ff85/bqpw11/dwarf20baby20rocks.jpg)
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