I am having some trouble with some frags I got from a friend of mine

I am having trouble with some frags that I got from a friend of mine he is a member and has a very beautiful established tank the frags were in great condition and everything was fine but some of the Zoas have a lime green slimy algae around the base of the pods and they are starting to choke them out does anybody have any experience with this if so let me know what you think it is and what I should do thanks for the help

 

my flow is pretty good it is a 14 gallon biocube with a 29 gallon biocube pump instead of the 14 gallon pump and I also have a small power head in there

 

the atinic bulb in there is old but the white light bulb is brand new I just installed it this week

 

I put the new bulb in right before I got the new coral