Condy anemone is an Atlantic anemone. Wether will host clown fish or not, I never tried. Heard of people who claimed it did but never could confirm myself. Wasnt about to try expensive clowns(should I say wild clowns) on a $2-3 anemone.
Either case, WOuldnt recommend COndy nor any anemone for nano. DOnt know the size of nano but can aquascapes with many Sp of
LPS frags which can resemble anemone and are readily avail thru coral forums for lot less money. And as others have said, some clowns will/do use tentacle of lps as if it were anemone.
Condy or other anmeone probably will limit the types and amt of coral frags you can safely house in nano.
Had clowns (tomato) in 20G nano with cerianthus (tube anemone, that's right, my usename. Pretty powerful sting which left few marks on my arms for a while as did elegant corals, carpet anemone) w/o a problem until someone (children's friend) spooked one of clown by tapping on the glass. Clown flipped and went into spasm and was gone before I can do any, not that I could ve done something/anything to save the clown.
Hope this helped.