What episode on Glee season 1 do Santana & Brittany have their fight?

In season 1 there is an episode where the girls get into a huge fight when Brittany starts hanging with Quinn. Which one is this? Thanks!|||Are you talking about Duets? That's in the 2nd season... You could be talking about Throw down... I am a Glee expert. I have a Glee poster, a Glee calender and a Glee necklace. I know every Glee episode by heart and there is no episode that exactly matches your question. I think you are talking about Throw Down. Where Sue takes half the club and Schue takes the other half and they prepare for Sectionals. Sue takes Santana but not Brittany or Quinn. So hope this helps! :)