Rinse it in saltwater first, then put it in.
The upside is that it's a good assimilator of many, many unwanted compounds and elements in a reeftank. Properly set up, it can eliminate any nitrogenous-waste problems you have.
Of course you have to regularly harvest some of the algae (this takes out whatever pollutant has been assimilated) or you run the risk of algal death dumping all that locked-up crap back into solution.
Caulerpa racemosa,
Caulerpa lentillifera, and
Caulerpa microphysa are among the species that I might associate with the common name 'grape'.
Their downside is a potentially explosive growth rate and a creeping growth pattern. Unless you harvest regularly (or keep the algae in a separate, lighted, plumbed-in compartment) you could have far more algae on your hands than you or your tank inhabitants can stand.
I prefer upward-growing algae: easier to trim off the top than to rip up 'rooted' runners.
All members of Caulerpaceae are notoriously leaky, meaning they can leach sugars and terpenoids back into the water. No big deal unless their biomass is out of proportion to the tank volume.
But hey, all algae have their downsides. Just make sure you know 'em.
. HMMMMMM, any thoughts on this would be great
Also if it matters it will go into my main tank until I get the refugium built and at this rate may take a few more weeks.
Large patches would turn white, cloud the water, and die. It kept happening over and over (almost every week there for a while). As fast as a new patch would start regrowing, it would go sexual and I would have to rip it out and do massive water changes on my tank. 
