I bought 2 hammers, one green tip the other brown tip, within a week 50% botak already. My water parameters are, 29C, nitrates below 10ppm, PH at 8.5, ammonia undetectable, tank has a couple of wrasses, scopias tang, clowns, mandarins, goby, fox faces. My white bubble with me for 6 months is ok. My brown gonipora 2 weeks old ok so far only thing extend half length only as compared to the shop when I bought, for lighting I use blue n white arcadia 40 Fl tubes ( 3 of them)....