01-13-2011, 06:29 PM
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Originally Posted by Christople
can i keep Soem plants with out fertilizer if the light is a 2700k. The tank is stocked with fish and there is plenty of poo to go around
Depends, but probably not. Plants need 17 nutrients, and all of them are unlikely to be present in the aquarium from other sources such as fish food, organics, tap water at water changes, etc. As steve086 mentioned, a liquid fertilizer is sufficient. I highly recommend Seachem's Flourish Comprehensive Supplement for the Planted Aquarium
. It is the only one I know of that has all nutrients and once a week should be enough; you use so little that it will last a long time.
Of equal concern is your light. A kelvin of 2700K is very high in the red with no blue to speak of, and plants need both to photosynthesize. A natural daylight tube with a kelvin around 6500K would be better. I can explain further if asked.