Quote:
Originally Posted by qsaark
Although I am using 4.6 W/G, the lights are hanging 8" above the tank. I switched to high light because my Rotala rotundifolia, Ludwigia repens, and pearlgrass were not doing well. After increasing the light, I have noticed a considerable difference in their growth and color. I also increased the CO2 from 21ppm to 30 ppm.
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We have no way of determining how much CO2 we have to that accuracy. If your using the KH/PH relationship, then you have between about 10-40 ppm. the only way to be sure is to use a drop checker with a KH reference solution.
Thats still a heck alot of light.. its more likely your plants were struggling for other reasons other than light. Nearly all plants will grow at 1/2 that.. its more than often CO2 thats the issue.. test kit methods of measuring are totally pointless due to the inaccuracy and other factors in the tank that can effect PH.
Dose with EI, then all you have to worry about is CO2.. use EI and a drop checker, and youll be amazed.