I didn't know that they liked shallow water either. Wonder if I should move the pot to the shallower end
Mine do fine in deeper water. All of mine are large lotus. You don't have the freezing issues I have, so it would probably do fine in shallower water.
from places that sell the tubers:
"Ideally they like 4 to 10" of water over the pot. I start out in the spring at a shallow depth of a couple of inches over the rim of the pan. This shallow depth will be warmer too. As new growth begins to sprout the pan can be gradually lowered to a deeper depth, but no deeper than 10 inches, if need be."
"Whatever type of container is used, it needs to be at least 6 inches deep and at least 12 inches wide.
Smaller varieties will grow in 1-to-6 inches of water. Medium and large varieties will grow in 4 inches to 3 feet of water depending on the variety. Never plant the tuber at the bottom of the container. Some people simply place the lotus tube on top of the soil and use a rock or brick to anchor the lotus tuber down. If the tuber is not properly anchored by the soil or weight, it will float."