[Jason Baliban]

There are a few things that will effect this issue. Pearling is O2 that is created during the process of photosynthesis. Plants need a few macronutrients to accomplish this task. You didnt supply information on your macronutrients....such as NO3 and PO4. However, you did supply your KH and PH. With these two measurements you can figure out home much CO2 is in your system. With your current readings you are at about 4.8ppm, which is pretty low. At your KH you would want to have a PH of 6.2 to have 19ppm of CO2....and you might even want more CO2 in your tank. Try increasing your CO2 or perhaps you need a better reactor to get the CO2 into the water. With that size tank, it is almost impossible to achieve proper CO2 levels without a good reactor. You might consider bringing your KH up to the 3 range for PH stability. Also, you might consider bringing your GH up to 5.
jB

 

[Jason Baliban]

Are your plants in good condition? Do you have algae problems? As gpodia pointed out, if your plants are growing well and you have no algae, why change the equation? The overall goal is what is important. If you are unhappy with your results now or you want to grow higher light plants, then you will have to make a few changes. As said before by others, adding more light, requires more CO2 and more nutrients. If you are looking to up everything i would start by getting some power compact light......they just seem to offer the most light for their size. What is your overall goal?
jB