I like the sound of splashing water when I'm in the garden. I also have a
small water feature, and last summer the neighbours mentioned politely, that
on hot nights when they had windows open, the noise was a little annoying,

I have some frogs that would make your neighbors appreciate the music from
the fountain. BEG

I 'could' move it to deeper water (30ins) but it would be right next to the
pump (a Hozelock Titan 2000), and I don't think it would like that.

I know my lilies prefer/preform better at 2 feet, perhaps you could
straddle the pump with a shelf to set the lily on? ~ jan

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(Do you know where your water quality is?)