I do believe the Scarlet Temples aren't fully converted, and may require you to wait for the tops to sprout runners. You then cut them below the new root runners and plant them in good stratum. I could be wrong, it was something I thought Cory mentioned in a pod cast. I did that with mine after hearing about it, and they are still going healthy, tall, and very densely packed levels of red foliage. I have a lot of natural iron in my tap water, with a high KH. I run mid to high light w/ medium c02 injection in a fully planted 45 gallon community tank. I can see some runners at the top of yours already. It worked from me but with my memory lol I might have just got lucky and misheard/misapplied advice...
Maybe someone else can confirm this about converting Scarlet Temples?