(not wanting to steer away from the original topic of this thread but) i dont think it is from stirred up debris unless you have tiny pond with big fish, any debris stirred up by fish is usually small and localised not enough to cloud up a 1400 gall pond !, i think you may just have to wait a while for your new filter to kick in and start working properly, and as for the man from columbia, i think he is a bit arrogant, shouldnt laugh at anybodys pond! we are all in the same hobby from 1 extent to the other, and back on topic, i think the theory could be correct regarding not enough nutrients in the water for the flowers on the lilly, as my irises only flowered for a really short period of time and the bullrushes are growing really slowly, maybe my filter is working too well !