Water Lilly problem

in Plants
We have had a dwarf water lilly for several years. Last year there were no flowers. We can see lots of leaves in the pot coming from multiple stems, but these have barely grown over the past few months. We put a fertiliser ball in the pot a month ago, with no sign of any impact. We bought another plant two weeks ago, same species but different colour, and it has put on lots of growth in just 2 weeks, but the leaves are all coming from one stem. Should we have divided the older plant, and if so, is it too late now to do this?
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Though it is better to do them early you can do them any time, but not winter .
I would have thought it is a good time in that you won't freeze anything off this time of year...
They seem to be doing better this year as I try to remove sludge and algae as often as possible.
I have nymphaea pygmaea. Not sure if I should divide them too, will check in the autumn.