My new Atlantis 2 has been installed for a week to the day and when I bought it the manufacturers Algae Scrubbers CI sent me a small pack of algae I requested that they grow on their test ATS. I wanted to try and seed the screen to kick start it as I have done before with my DIY ATS and my more recent Seabreeze ATS. They duly obliged and sent me some along with my new Atlantis2. When I received the algae I immediately noticed it was no GHA but something quite different and after some researched I am convinced it is Ulva intestinalis. When I set up my Atlantis2 I gave the screen a light covering of Nyos cement and left it 5 hours to cure. The small amount of Ulva was applied and I poked some of it through the screen using a toothpick to help it stay on the screen. Once the Atlantis was started quite a bit of the Ulva washed off but some did remain. Each day the Ulva doubled in size perhaps more and after just 5 days there was an amazing amount of growth so much, in fact, I trimmed the long lengths which hung below the bottom of the screen. The Ulva grows at an incredible, amazing speed. A friend who set his bespoke Atlantis up 5 days earlier and had never had an ATS on his tank before reports exactly the same with his after he had seeded the screen with some Ulva intestinalis just has I had done. I am not stranger to ATS's having built 2 of my own along with owning 3 other ATS's but have never had algae growth of any kind grow so quickly and get so established in such a short period of time. Ulva intestinalis must be one if not the fastest growing algae you can grow in an ATS and I doubt there will be better algae to grow in an ATS to reduce nutrients. I have attached 2 pic's showing both sides of the screen taken 5 days after setting up the Atlantis 2 and seeded the screen with the Ulva intestinalis. I think you will agree that is some phenomenal growth from a fresh screen(apart from the seeding) to so much in just 5 days.