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It sounds like it is being outcompeted for nutrients. The other plants might be taking up everything before it has a chance to get much.

The older leaves, are they covered with algae or are they looking ratty in any way?

I have an anubias Nana that has absolutely exploded with growth wince I got it. I have had it for about 5 months. It had 6 leaves and the rhizome was only 2.5 inches long. Now the rhizome is well over 5 inches long and there are 2 rhizome splits that are 2-3 inches long with 3 others that are about 2 inches. It also has leaves growing under and over leaves.

I had to remove the old leaves that were damaged and old to get the new growth and I do actually dose fairly heavily with medium low light. I would trim off the old leaves and trim the roots down to about 1/2 inch. Make sure not to bury the rhizome at all. I have mine well above the substrate on a hand made plant anchor. An piece of driftwood with some thread lightly wrapped around it to keep it in place should do the trick. The roots don't have to be buried but in my experience they do help growth rates and overall health. Every time I trim the rooted mine goes into a dormancy period and doesn't grow until the roots get back into the substrate.
 

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I think it owuld be too much like burying it if the bags smother the rhizome. It needsw to be up on something so the roots are the only thing touching the substrate. Some say you can set the rhizome on the substrate but most i see are a good 1/4-1/2 inch above the substrate.
 

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Looking closer at the roots it seems like they are not doing so good. It might help to stimulate some new roots and help the over all health of the plant to remove all the roots to about 1/4 inch from the rhizome. I have done this a couple times with mine and it does go into a growth dormancy period as far as new leaves but the roots really start to come out thick and new.
 

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For me they seem to do much better once the roots get going and really bury themselves in the substrate. I have actualy tortured my Nana a couple times by removing old leaves and cutting the roots way back. Mostly because I needed to pull it out and the roots would not go back in the subtrate. Each time the plant "seems" to go into a root dedication period where all the energy goes into the roots and then once the roots disappear in the substrate the leaves come by the dozen it seems.
 
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