I have two guinea pigs and about a month and a half ago i was having a major fly problem mostly in my room where the cage is. We wanted to get rid of the problem so we moved the pigs to the basement for about a week and we cleaned my room very well. Then we went to buy new coroplast so that I could build a new cage for them because we thought that the cage might be part of the problem. When i was taking the old cage apart I had to cut the coroplast into pieces so that it could go in the garbage. I found that the flies had laid eggs in the coroplast and they had hatched in there. The flies have returned and my mom is starting to get angry. My dad just noticed today and he doesn't like the guinea pigs already. I was thinking about getting them store cages but I think that would be really unfair considering they have a 2X6 c&c cage (it is split because they dont get along but it meets the requirements for both pigs individualy). I also don't want to have to give them away because that would also not be fair to them because they came from a shelter. I need to get rid of the flies but I'm afraid that they are already in the coroplast. Is there anything I can do to solve this problem? I really love my pigs and I dont want them to have to go to a shelter again. Please help!