Do you guys get open flowers in the late afternoon (if you are gone to work all day), or do you have to wait until weekend to see the lily blooms? Mine are not open when I leave at 8:30, and closed by the time I get home at 5:30. At first I figured they were not opening. Check them this weekend. Good luck.
Also, when you plant new tubers, put rocks (all sizes, small or larger pieces) on top of the kitty litter, just not solid, and that will help hold the tuber down now, and after the pads begin growing and the fish are swimming through them being chased or chasing! Betta is right, though, once they are rooted well, they will stay put. My problem is they multiply so much that every spring I have learned to pull each pot, divide and just put one tuber per pot. Don't forget the fertilizer when you repot, or you can put in tablets anytime. Also, someone taught me to use a piece of paper towel, put granulated fertilizer in it, wrap it up and shove it down into the clay. Use any type of fertilizer that is for flowers or "blooms", and the middle number is the highest, i.e. 8-24-8. I watch for it during the year, and buy it on clearance end of season. I now have a good supply probably will last me several years! Plus, found Osmocote in small 2 oz packets at Menards on sale for 20 cents! One packet is enough for at least 2 pots.