I am a first time grower and would like to know if it sounds like my plants are growing at a normal rate. They are 20 days old now grown from seeds they are about 4 1/2" tall and starting to grow their 4th. set of leafs. While they look healthy to me I wonder if they should be bigger by now. I have had them under a 90 watt LED grow lamp for 6 days now with the light about 6" above the plant going on 18/6 cycle. The plants are a Indica strain called god bud that came out of Canada. Any information on what to do would be a great help.