Is 96w of 6700k CPF light over 20 gal freshwater planted tank too much?
I have a 20 gallon freshwater planted tank with flourite substrate and a 96 watt CPF quad bulb in 6700 k . Is that too much with out co2 ?
Thanks
That’s just a hair under 5 watts per gallon. Whether that will be too much for your tank will depend on the types of plants you want to keep and their lighting intensity needs. See this link for a way to calculate the intensity: http://faq.thekrib.com/plant-lighting.html and this one for the lighting needs for specific plants: http://faq.thekrib.com/plant-list.html
If you have fish in the tank, they will provide some CO2 for your plants, and even the plants release CO2 at night. Good tank maintenence and water changes will reduce the nutrients availble for algae. You can also control this with the photoperiod, but for a planted tank, you need to keep the lights on. Remember your plants need the light for photosynthesis too, and if nutrients in the tank are limited, the vascular plants generally out-compete algae in acquiring them.
Some additional reading:
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