First Grow ever with Hydroponics

Hi! Started my new grow a couple of weeks ago, my friend gave me some plants because he was overstocked and was going to throw them away. So I decided to save them. I have made a hydroponic system with hydroton. As of right now I have them on 12/12 light schedule and have placed House and Garden base A&B in the water. Right now I do not have the greatest light set-up, but for now it works. I have noticed the older bottom leaves to be turning a slight yellow, but the other are green. If anybody has any suggestions or need more info - please ask or tell! Thanks! I will be posted pics of my plants soon to get better advice.

Sounds good man. Post some pics. How many weeks flowering? What strains? Lower growth yellowing and dying is natural, no worries there

Here are some pics from the grow. I am not sure the strain because they were given to me from a friend and he was unsure. I am guessing he gave me 2 different strains, since they look different. I have the water come on every 30 minutes since the media is hydroton. These plants have been flowering for about 2 weeks.