Yellowing plants

Stealing

Well-Known Member
ok, I was growing my plants in soil, and then switched the soil for a sand, compost, and perlite mix for better drainage, and tried to put my plants in a hydroponic system. i was using a bubbler system, and the older leaves started to yellow, and new growth is very, very green, yet small and wispy. I have no Idea what is causing this and i need someone with more experience to diagnose what the problem is. they look healthy other then the slow wispy growth, and the yellowing.

Here are the pics:
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