Getting Anubias Petite to Stay in Substrate

Some of mine prefer to send roots a ways down toward & into the substrate rather than attach to the wood they're tied to. Just looking for more nutrients than are in the water column I think.

After a while some substrate will become attached to the older roots & help hold it down. Wait & see what the new roots & rhizome do, it may be ok-
 
How deep is your substrate?
 
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