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Plants have a minimum threshold for light and the 1.6w bulb simply doesn't meet that threshold. The plants are using up their food supply faster than they can produce it. This is what is causing the deterioration. 1.6w is equivalent to total darkness as far as those plants are concerned. For your tank you need at least 20 watts of light if not closer to 30 or 40w.
Do not use incandescent bulbs, you need fluorescent or many LEDs, but fluorescent will be the cheaper option between these two.
Do not use incandescent bulbs, you need fluorescent or many LEDs, but fluorescent will be the cheaper option between these two.
