I went ahead and bought some tabs, water soil, and a bucket for the lilies. I pulled one of them up and it's about the size of a milk jug, it's huge and has only been in the water for 2 months. I don't want to know how big it will get with regular fertilizing. The lady recommended a HUGE tub for the WL, but it is literally the size of my plant shelf, maybe a little wider even. There was no way it would work. I got a bucket about half the size.
Thanks for the help, ladies. Next time I think I'll look for some osmocote, instead of a little, $11 jar of fertilizer tabs.