Think about this way. Where in the wild do nems live? Shallow waters in high park and moderate currents in the ocean. Your par is just way too lowAt this point this is my guess too. What would you say is the minimum? I know at least one reefer keeping a BTA at 75 PAR but I understand the way it acclimated might be different. What confuses me is they move away from the light rather than trying to stretch for light like corals do