Well I took my cleaners back to the store so we'll see what happens now.
Both nems have turned brown (were expensive sunburst & beautiful bright red rose, grrr!
) and shrunk considerably. Tentacles are v small now, like they're starving. I was feeding silversides or enriched mysis every couple of days, but I fear the shrimp might have been making off with the food after I left. (Caught one digging the food right out of one of the nems mouth/stomach once.)
The nems aren't sticky enough to hold onto food anymore, so I guess I just have to hope for the best. Water conditions & light are excellent as far as I can tell. All other corals seem happy and no gaping nem mouths so far. Fingers crossed...!
Hope everyone's nems pull through! I'll be back to post what happens to mine in the hopes it might help.