Leaves Going Brown

[tez2k007]

Some of my leaves on some of my plants are going a brownish colour. How can I stop this???

 

[Jallen]

Some of my leaves on some of my plants are going a brownish colour. How can I stop this???

Pick them off and new healthy leaves will grow.
It's just like normal gardening. You cut off the stuff that dies so no energy is wated on it.

 

[Anguilla82]

more light, more nutrients and more CO2 will all help plant growth.