Aggressive lawnmower blenny

[Rmckoy]

The only aggression in my tank seams to be from the lawnmower blenny .
I had 1 sand sifting goby , and after over a month of being together the sand sifting goby disappeared after seeing numerous little spats under a cave .

I replaced the lost sand sifter with a much smaller one ,
Didn’t even last 2 days and noticed this morning his head was marked up pretty bad .
A few hours later finding the sand sifter dead .
Are lawnmower blennies always aggressive towards gobies or other blennies ?

 

[Uncle99]

Same for me, removed the Lawnmower Blen, no further problems in more than a year now.