I'm sick of this crinum, too. Finally thought I had a handle on it staying in the soil, and I came home to find one floating. I don't even like it that much, and have way too many new plants coming, so it's going in the garbage. It's not even worth trying to get rid of on here, as it has some algae on it.
54g Corner Bowfront Planted, 2x24w T5HO
220g Mixed Reef