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Old 12-30-2017, 11:59 AM   #2 (permalink)
hoppycalif
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Default Re: Lighting question

One Planted Plus light will give you about 60-65 PAR at the substrate level. That is high light, or possibly high medium light. In either case it is plenty of light to grow all of the plants you have. You need a relatively high CO2 level to use that much light and not have lots of algae problems.

How are you adjusting your CO2 bubble rate? You need around 30-40 ppm of CO2 for that much light. You can measure how much you have, with enough accuracy, by measuring the pH of the tank water after the CO2 is off for about 12 or more hours. Then measure the pH after the CO2 is on for at least 3 hours. The ppm of CO2 will be about 3 times 10 raised to the drop in pH power. For example, if the pH drops from 7.0 to 6.0 with the CO2 on, you would have about 3 x 10 to the first power, or 30 ppm. If it drops from 7.0 to 6.2, you would have about 20 ppm, and if it drops from 7.0 to about 5.8, you would have about 45 ppm.

In my opinion the PPS method for dosing fertilizers isn't the best for high light tanks. Much better is the EI method - https://www.aquaticplantcentral.com/f...ing-guide.html
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