Blennies are a cool fish i will always have one in my tank. They are generally only mean to there own species but they wont back down if the clowns try and chase them.
They are an extrememly forgiving fish in terms of care and feeding. Regular fish food will be accepted and if there is algae in your aquarium you probably wont have to supplement them with nori.
Go for it, they are inexpensive and have tons of character just dont keep two in a tank that size.
Cheers,
Ken
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