You run the risk of it 'going A sexual' no matter what. Chaeto is the export algae of choice for that reason.

'i have some grape caulerpa, Caulerpa Prolifera and cheato.....'

Get rid of all other algaes except the Chaeto, the others will quickly out compete it (especially the grape) for available nutrients and wither away.. Also, if a piece of grape happens to get into the display and begins to grow, it can take over the whole tank and its a real pain to get rid of once it gets a foothold in the rocks...