it looks like it has an exoskeleton.....
for the 4th time.... is it hard or soft?!!!
my guess it is it some type of isopod.
to tell you the truth...... flushing it wont make a difference unless it is bad. if you realy realy cannot identify it, i say flush it just to be safe. if it is benificial, and you only have one, then it isnt oging to do taht much