spongoda help

[saltburns]

I bought a spongoda(sp?) frag at our frag swap and although it has increased in size nicely, it is also turning brown. the fella i bought it from said it likes a lot of light so after a few days i placed it at the top . I have t5 lighting that is growing a very nice miami orchid acropora and some green stylophora. what to do?

 

[Blindside]

Check your levels(phos,mag,calcium,alk,ph, salinity), and then check them again, do a water change if that doesnt help I would investigate your lighting.