How big is your tank?
I usually get 4 green chromis they are a schooling fish I like them a lot have lots of personality and unlike most chromis tend to get along with tank mates
Putting more than one Blennie per tank unless a mated pair is a crap shoot depending on the size of tank as most blennies tend not to be friendly towards each other including different species of Blennie.
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 My aquarium is nothing but a smorgasbord for my cats.....
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