It will surely multiply. There is a small chain of roast beef sandwich joints in my local area and each location has a very large reef tank. The smallest one of the three is a 700 gal, that particular tank is jellyfish only, so no issue. The others have incredible aiptasia growth, along with huge amounts of green algea. They used to look really nice and I would get lunch there just to sneak a peak at the tanks. When I was there last the aiptasia and algea was awful. I overheard another customer mention to her husband that the tank was beautiful and very colorful. She went on to mention that all those little anemonies were really cute and they were all over the place. She commented on how much they must have cost!!!!
HA HA!