GuPiEs????????????????

I'd check your water conditions. If you have a test kit, I'd use it, and check Ammonia, Nitrite and Nitrate levels. I'd suspect that your ammonia and nitrite levels are high now after two weeks in that tank if it wasn't cycled. I'd go ahead and do a 50% water change, using a good dechlorinator like Prime and same temperature water. Any time fish don't look good, check the water quality first. That's usually the problem and the easiest fix is to do a major water change and then keep the water changes up. Most people don't change their water enough and fish end up getting sick.