I was reading on this site that Kaytee Forti Diet claims that they have enough vitamin C and all other nutrients for a complete balanced guinea pig diet. I am currently using L'Avian Premium Plus and Kaytee Fiesta. The article said that Kaytee Fiesta also has all the nutrients neccessary to maintain a healthy guinea pig diet, including vitamin C. I have been feeding my 5 pigs these 2 types of brands for about a month now. I noticed one of my guinea pigs began to show symptoms of vitamin C deficiency. He had diaherria, crusted discharge in the eyes, and excessive weight loss. I brought him to a local vet asap. They had told me that he needed more vitamin C then just the pellets alone. At an instant when I got home I fed them oranges and strawberries. My 4 other pigs attacked the fruits as if they were starving and my one sick guinea pig just sat there and ignored the fruits, even when I offered it to him. 2 days later my guinea pig died after I had seperated him from the rest of the 4 due to his illness. I want to prevent this problem from happening again. Right now I am still using those 2 brands of food and feeding them oranges on a daily basis. If I decide to switch over to Kaytee Forti Diet, will it contain enough vitamin C to substitute for the fruits I am giving them? I find giving them pellets alone to be more cost efficient and easier. If not I will continue to feed them Kaytee Fiesta and L'Avian Premium Plus along with the oranges and strawberries on a daily basis. I also give them fresh water and timothy hay on a daily basis. My 4 pigs are doing fine and healthy as of right now. Any advice would be greatly appreciated.