She must suck at hide-and-go-seek . My first guess would have been a Yellowtail damselfish (Chrysiptera parasema), but I can't say for sure without pictures."Lucy" is all blue with no yellow on her belly. So you never know with Petco, They do get them from a big supplier here in LA. Everyone I have seen at Petco here has HELLE, they do run carbon in their systems, and I am sure it is not the best. I have convinced one manager at one not to run carbon in tanks with tangs.
Unfortunately the pictures do not show the extent of the caves and hides, But everybody has their place or niche. It's funny I have a crack/ fissure that Lucy hides in, but she is bigger now so her tail sticks out. But she still thinks she is being covert.
Thanks! I was referring to the crab possibly hitchhiking off native CA macroalgae (as you mentioned on your other thread), but who knows what really happened...Thanks for your opinion on the shore crab, I was joking on it taking a Uber to my house. In all seriousness it shouldn’t be in there.