Strange things at night

Could they become a problem in my tank? I know they are good CUC, but I can’t believe I have at least 3. So should I leave them be?
I doubt they'll be an issue (so I'd leave them be as long as you think you/your tank can keep them proper fed), but if you start finding a lot more or if they start causing issues, I'd be interested to know.
 
I doubt they'll be an issue (so I'd leave them be as long as you think you/your tank can keep them proper fed), but if you start finding a lot more or if they start causing issues, I'd be interested to know.
I will certainly keep you updated! Thank you
 
I doubt they'll be an issue (so I'd leave them be as long as you think you/your tank can keep them proper fed), but if you start finding a lot more or if they start causing issues, I'd be interested to know.
Oh and as for proper feeding, I keep nori in my tank for miscellaneous creatures because thankfully I don’t have much visible algae.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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