Since feeding progold, i have had much more brilliantly colored, and overall much more healthy, and "perky" fish. My fish have grown lots since feeding it too, even my little stunted lionhead that had not grown for a yeat grew an inch
When you feed progold, you are boosting your fishes immune system also since it contains special stuff for that purpose, plus probiotics. Also i feel good in knowing progold does not contain carcinogenic preservatives like a lot of other brands do.