i had a bi color and yellow watchman goby in my 20 and i had no problems. watchmens will go back in their hole if anything comes close to them that they are scared of
ok you may see a little agression but not too bad should not be any fin ripping etc.
The gobies are territorial the blennies are not as, quite fun to watch.I have found blennies seem to "taunt" the gobies and other blennies.
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