Isopod?

skr791346

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Found this little guy in my filter sock. Bad or harmless?

Not sure related but coincidentally, my Blue Throat Trigger that I had for about 6 months (fully quarantined for 45 days prior to main tank, healthy, ate like a pig) started swimming around like it was "drunk" about 2 weeks ago, not eating and just letting food pass by. Now it just hides all day, doesn't come out for feeding. I didn't see any isopod on the body before it began hiding 24/7 though I did notice it's belly was really fat. Totally had me scratching my head as to what could be causing him discomfort. All other fish look normal, no visible isopods.

Also took a video to see if it can roll up like a pill bug as I read that it could help with ID. It can roll up though it doesn't stay rolled up as can be seen in video.
https://streamable.com/6n1vm

Any help or advice would be appreciated.
pod_1 (1).JPG
pod3.JPG
pod_1 (2).JPG
 
Eyes on the front suggest predatory but I'm no expert!!
 
Ugh, I think it's the predatory type.

It does roll up when I flip it on its back.
 
Predators won' Curly up they'll stand they'e ground .
 
The predatory type can curve but can' t roll into a ball like a Roly poly bug. Only the safe kind does that....
 
I should clarify - it only curled up outside of water when I flipped it on its back on a piece of paper towel, but mainly trying to catch its own tail so it can flip itself over. In water, it didn't curl up defensively and instead just scurried away when prodded.
 
Ya probably not good...keep your eyes out for more.
 

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