mandarin vs SPOTTED MANDARIN vs LAWNMOWER BLENNY

[sefo]

As you all may know I have a 55g with 55+ LR and I was wondering, 1st the difference between the mandarin and the spotted mandarin and from all those three which one would do fine in my tank keeping in mind that "there is plenty of food for the mandarin" and I have
2 percula
1 cleaner wrassel
1 foxface
and my cleaner crew
I just want to know is I can add one or two from the list "mandarin, spotted and lawnmower" after that no more fish for my tank.

 

[mr . salty]

I would go with the blennie. Although you may think diferently,a 55 with 55lbs of rock will not keep a manderine alive for long.He will quickly eat up all the avalible food then slowly starve.