My plants are about 3 weeks old and are in seed raising soil and the leaves are starting to turn yellow from the bottom and some brown spots on the leaves. attachment=1894250:ImageUploadedByGrasscity Forum1444373966.802831.jpg]
Looks good so far, how big are those pots? Might be time to transplant. When you do add more aeration to your soil mix ( i.e. Perlite)
Mate ..! not a lot of perlite in that pot, shoot to bunnings and score a load of perlite, its adds 02, prevent this nute burn and prevents root compaction in in one, pot up to a 15 liter pot and bob ur uncle, water well too!