Hi i recently moved my 2inch plec into my 16gallon with my betta and cories as he had been attacking my bnp. Last night I noticed my plec jumping on the back of my cories? When i got up this morning my cories had red marks on there back and one had red on it's mouth, thinking it might of been my betta i moved the cories but now I'm sure it was the bulldog. Has anyone had problems like this and would the plec be able to mark and hurt my fish? Thanks