i'm not a big fan of hermits and snails, they always seem to mess up corals and when you don't have the right amount (ie too many) or if hermits get hungry and start eating snails then you have unwanted waste. Of course this is my opinion, in my 25g i have 1 nassarius and 1 blue hermit.
As for fish stocking a blenny would be a great choice. I have a tsb and he is great! takes care of different algae - not sure if a blenny would have any problems with a watchman but definitely a great fish
my 25g has 2 clowns, tsb, royal gramma, 2 chromis
cheers
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