FYI,
The critters being sold as nudibranchs, aren't.
They are slugs. [img]images/smiles/icon_eek.gif[/img]
Sea Slug forum Take a read here..
They are very specific in the algae they eat. Some eat hair but it seems a good part only eat bryopsis.. Once they eat that particular food they want they don't switch over to anything else. For the most part.
I have had one for a bit and it is eating bryopsis in my tank but leaving the bit of hair alone...
Just so ya know.