When I had a haddoni, livestock in the tank often went missing. Granted, I never actually saw it happen, but there were always a load of empty shells in front of it. My shrimp population also would go extinct very quickly.
With the giganteas I have kept, there are much fewer empty shells and fewer missing fish. I've even managed to maintain a small shrimp population (for now). However, stuff does go missing once in a while, and I'm never sure who is to blame.
I never direct feed my anemones these days though. When I feed the fish their usual mixture of food, the anemones always manage to catch some of it. I have one bleached blue gigantea (light blue at the tips, but the base of the anemone is white instead of brown) in my tank which has managed to gain back much of its brown color, but given that it deflates and inflates to extremes worse than Jekyll and Hyde, I am surprised that it even managed to live longer than a week, much less gain back any color. It does inflate larger and larger with each day, but the deflating issue has not improved at all. If you do get a gigantea, be sure that your first one has all the proper vital signs. I really liked the color of this particular anemone (and generally trust the store I bought it from), so despite my better judgment, I decided to take the risk and attempt to raise it back to health. I wouldn't take that risk though, if I wasn't prepared to lose the bet. Many of the giganteas in store here in Japan are locally hand-harvested, so they're in better shape than many of the specimens that travel across the Pacific ocean, but even then, many aquarists here consider them very difficult to keep.
My other gigantea are in great shape and deflate slightly at night, but none of this Jekyl/Hyde business of the bleached one. It's so extreme that on some days I'm positive it only has hours left. Thankfully, I've been wrong so far, but like I said, no guarantees.
