Yeah, I don't think it's the clowns personally. My lightning maroons think every nem i introduce is the only one in the world and jam in there hard but my nems don't seem to care.@NanoCrazed have to find rock rubbles then .. all my rocks in sump are big ones ... may need to break it.
so potentially baby picasso x 2 may not be the issue here right? i mean the nem is probably 5 times or 7 times bigger than them.
If they get unhappy with the attention, they just shrink inside the crevice until they're good and ready.
They nem may move eventually if you change something in your system that touches flow or lighting... but at least this will give it a good start.
This whole cave theory of mine is the only thing I do outside of a float and ensuring salinity is close before introducing to my tanks. I lost 2 nems previously before I finally doing this as they just kept walking into a powerhead or melted from stress