When plants become covered in algae, especially lower leaves this is indicative of plants being unhealthy. The bottom leaves are deficient is one required nutrient, be it light, co2, or organic, and are therefore leaching their nutrients back into the water column for algae to feed off of. In this instance photosynthesis is happening. and plants may pearl, especially from damaged areas, but they are not healthy. Additionally, and it has been proven by either tom barr, zapins, or zorfox that when healthy, plants release a chemical that either deters or outright stops algae from growing.
Op, ur specific tank may be healthy, and it sounds it, but pearling is not the only proof needed of a healthy plant is the point here.
If in doubt, add more plants!
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Last edited by jeepguy; 08-22-2014 at 07:24 PM.