I'm sure your favia will do just fine right where they are.
I picked up 3 eyes and within a week 2 eyes disappeared. Don't know why but I tried saving the last one moving it around and stuff so right now I have it on the SB with medium-low flow and minimal light sometimes shaded by my flowing xenia. To feed it I've cut the top of a water bottle to shade the flow so I can target feed mysis. It's been hungry and has eaten almost every other day. t's been about a few weeks now so here's a pic of the last eye I have. I've noticed that it's been growing so I hope it keeps up.