Is this safe?

[MaxLR]

Last night I noticed a little thing it looks like it has 3 thing on its head and has a lot of legs. It looks like it likes algae because I only saw them sitting on places we’re there is algae. It can swim but walks most of the time and I’ve only spotted them when it was dark at daytime they are all gone. I hope somebody know what this is and if it can be any danger to fish or coral. Thanks a lot!f

 

[Retro Reefer]

Not sure but it almost looks like some kind of isopod. Some are safe some are not.

 

[35ppt]

Redacted

 

[MaxLR]

It looks like it’s a Dynamene sp. thanks a lot for the help. I was scared when I saw it hahah.

 

[35ppt]

Redacted

 

[Retro Reefer]

Bingo! The third appendage was throwing me.. lol

 

[MaxLR]

Again thanks a lot for the help!