id this plant

hey guys i was just wondering if you ould id these plants and let me know whether they would work in a refugium cheers

 

feather caulpera
very good for refugiums but you need to keep up on it to keep it from going sexual

 

when you say keep up on it you mean keep an eye on its growth?

 

well sort of
when a macro goes "sexual" it releases a bunch of spores to reproduce elsewhere and this can be toxic in smaller systems

if its going sexual it usually means the plant is dieing from lack of light or trimming etc.
here is a lot more info on it: (under things to look out for)
ReefCleaners.org | Clean Up Crews and Macro Algae - Macroalgae Care

 

cheers for all the help i plan on using it in a sump fuge for a 140 ray tank

 

Caulerpa also goes sexual as a response to death by "starvation". Keep in mind they feed off nitrates and phosphates. If you do introduce them, keep an eye and when your nitrates/phosphates hit 0 trim it WAY back and start watching for any sign of bad news.