Mainly due to overfeeding. They thrive on the leftover food and multiplied from there.
You can control the feeding and meanwhile siphon out as much as you can. I used to manually remove them from the glass too.
Can also try making some sort of a trap like using a piece of food (tablet) on a net. Come nightfall, they'll go onto the tab and you can them get them out.
The fastest way is to do a tank overhaul which I did once, when I couldn't fight them anymore.
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FLORENCE, capital of the region of Tuscany, has a population of around half a million inhabitants, spreads on the banks of the Arno, between the Adriatic and the Tyrrhenian seas, almost in the middle of the Italian peninsula. It is a city which bustles with industry and craft, commerce and culture, art and science.
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