can someone tell me what this is????

[orangeptrinh]

can someone tell me what the magenta stuff is?? the ones that look like pom poms
http://www.geocities.com/orangeptrinh/fish.html

 

[attml]

It kind of looks a little like cyano bacteria? How old are your lights what is there Kelvin Temp (ie 6600K, 10,000K etc.)