Nasty hitch hikers... need to eradicate

Much to my dismay, I discovered my little friend returned to it's same 'ol spot today. It looks different than before... not developed as much (shorter tentacles, not quite as big) and mostly clear. Looks like I didn't quite get it with the Joe's Juice last go round. I must've killed only part of it, which allowed it to re-grow itself from the base up. I really hope I didn't make the problem worse. I've been looking around daily for other signs of more of them, but so far I haven't. I'm going to keep my fingers crossed and give this one a dose of JJ as soon as I get it back from my friend. Stupid Aiptasia!!!
 
I've been seeing a lot more smaller crabs in the tank lately and I know they are not like the red filter feeding ones I have in there. One is more of a brownish color and has hairs on it, while the other is white and almost looks like it's got little spikes on it. Here are the pics:

White crab

Brown Crab

Should I be erradicating as I find them?
 
The white crab looks a lot like a porcelain crab although I can't tell for sure. They are 100% harmless filter feeders and some of them will even live commensally with corals and anemones. Very cool IMO. The brown one I can't tell at all.
hth & I'm not 100% sure
Chris
 
I'll keep an eye out for better pic. opportunities. Thanks for the replies so far.
 
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