Red...??? I'd be more concerned with the yellowing of the leaves in general, yellow leaves like you have, is indicative of severe nute poisoning, or severe N deficiency, but as you have recently transplanted we gotta go the former. Flush the pot with 3 times the volume, with Ph neutral air temperature water no nutes for 2 weeks allow to recover, then feed at 1/2 strength. To my blog and check out the library peace "V"