Herbavores and feeding seaweed/algae of different colors.

[kv2wr1]

I've noticed that there are about 4 different kinds of dried seaweed/algae available (red, green, purple and brown). Are there any advantages of certain ones to particular fish species or is it good to just vary the diet and alternate between these along with other foods like spirulina, mysis, etc.?

 

[rssjsb]

Variety is good.

My own experience is that my tangs, angels, and butterflies have always preferred nori to any other kind of algae. I'm not sure why. I've tried the purple, red, and brown, but the reaction is, meh.