Just got off the phone with fluval. He said that can happen if there is a big temp change. I haven’t done anything with that tank for 2 weeks so still not sure why it happened. He also said that they would replace it after I responded to the email he was going to send. So I gave them pictures and a screenshot of my purchase. Thankfully aquarium coop saves past purchases. If I get it I’ll probably save as a backup as I plan on switching my heaters to coop ones as I replace.