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Yes they are! do you know could they cause my guppys to get stressed and die? they are constantly going at them.

Hi I have recently got a tophat blenny (24hrs ago). Very confident and curious. Today I woke up and she is so aggressive towards my guppys, she even tried to nip my discus fish's back fin. I have just found her with a dead guppy and trying to eat it by thrashing it around. Is this normal...