Coloration problems after light, feeding, repotting changes
Hi, I've been growing African Violets now for about a year. I struggle to keep plants alive but through a great deal of continual research have kept 4 AV's alive so far.
I'm still in college and my lighting situation is less than ideal so I recently put my plants under a grow light. I hadn't been fertilizing them but have started that recently and also re-potted them with new AV mix into self watering pots. 3 seem to be doing great and are growing blooms which they haven't in a long time! However, my heartiest one recently developed a brownish discoloration around the leaves (see picture) and its new leaves are growing in lighter. This one was also recently separated into 3 plants (it was store bought this way) but was the main plant with the large root system, so a lot of changes.
So, is this problem due to too much light, too much feeding, too much watering (I try not to leave the water in for too long even though its self watering), a difference in soil properties or something else?
My guess is the brown is from the fertilizer and the bright green is from too much light?
I'd really appreciate the help! I'm really trying hard for my "babies"!