as LOC NAR said, no nutes for 2 weeks ... no more B1 additives, either ... those 'Oasis' thingies look a lot like RapidRooter plugs, if so, that's great :thumbsup: ... overwatering, too damp medium, also causes yellow leaves, etc ... don't worry about your light distance right now ... while building roots, the plant doesn't need the light ... move your lamp closer, if and when , the stems start 'stretching' ... I didn't use T5s, but T10s and T12s, need to be kept within an inch of the tops ... for now, your distance seems fine, no stretching ... be patient ... :smokin: