Just wanted to share my pain. This is my 180 that is 3-4 years old. Upgraded from my 10+ year old 90 which was an upgrade from a 15 year old 55. All my tanks were always clean and spot on with parameters. I got 2-3 weeks behind on my monthly cleaning this month and the Dino had a chance to get a strong grip. Everyone is fine, but gravel is ugly. Time to fight some Dino.