Looks nice (other than recession). As long as the recession stopped, and your parameters are stable (and at the right levels), it'll come back. Hopefully it keeps those nice green polyps.
My tricolor validia grew for the longest time, but I swapped it with Soulpatch for a frag I really wanted, and the small piece I kept has been just receeding like what you're seeing. It happens. It'll come back. (FYI I think with current LED fixtures, the bottom/shaded/under-side parts may stay that way. LEDs don't light under acros, where other lighting does (though we're not sure why)).