I took a cheap turkey baster (like a giant eye-dropper about a foot long
with a squeeze bulb at the end) and extended the tip with a short length of
plastic tubing... long enough to reach my tank gravel while the bulb end
stays high and dry out of the water.

When you see a significant piece of fish-poop, just suck it out.

(I have a dog, so this idea was a natural.)

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Charles Gillen -- Reston, Virginia, USA