Good isopod or parasitic?

[SteveVai9708]

I found this crawling in my tank (this not a pic from my tank, but it looks very similar), so is this a good isopod, or parasitic.http://https://www.google.com/imgres?imgurl=http%3A%2F%2Fwww.melevsreef.com%2Fsites%2Fdefault%2Ffiles%2Fsafe_isopod.jpg&imgrefurl=http%3A%2F%2Fwww.melevsreef.com%2Fnode%2F417&docid=ynQUrwRwaIqzIM&tbnid=sbykkrdoXqT94M%3A&w=640&h=480&client=tablet-android-google&bih=600&biw=960&ved=0ahUKEwjC6PO4zcrNAhXHDj4KHR2KDJYQMwgcKAAwAA&iact=mrc&uact=8

[Sugar Magnolia]

Your pic isn't showing.

[SteveVai9708]

http://https://i.ytimg.com/vi/rcM8TTo5r1A/hqdefault.jpg (http://i.ytimg.com/vi/rcM8TTo5r1A/hqdefault.jpg) Sorry!

[Sugar Magnolia]

Harmless munnid isopods. Nothing to worry about. ;)