What am I doing wrong? Is there some trick to not polluting the water when feeding zucchini.

What I do is slice a piece, dig out the seeds & then attach it to my screwcumber thingy & put it in the bottom of the tank. It only stays there 24hrs, but already by then the water is cloudy & there are fine bits of stringy zucchini in the water column. The water gets a 50% change daily, but i can never suck up all the little floaty bits.

How do you all feed zucchini & do you find the same problem - or is it just me