The reasons are:
Their feet are too hot if the tank is above a radiator; a piece of protective asbestos over the radiator should normally suffice.
Too little, or unevenly spaced toplighting, especially if the tank is more than 15 inches deep.
Water too acid.
Not enough fish to fertilize the plants.
Plants were allowed to get too dry after planting.
Not enough room to grow; either thickets too thick or lead weights too tight.
Wrong kind of plants, or more rarely, unsuitable water in the tank for that particular type of plant.
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