Try with /cofh killall squidOk, First I really like this modpack, but I'm posting this here as I've never had this bug before.
Okay, so I came back to Hubris after I stoppe playing MC for a while and when I loaded my world it was rediculosly laggy. I discovered the problem to be an obsene amount of squids just outside my home (I'm on a penisula beach) and I can't seem to kill the buggers off and I am running out of ideas. Just asking as I would hate to lose this world as I've acumalted alot of stuff and don't want to restart my restart if I don't need too.
That command is also very useful when there are lots of tainted creeper (/cofh killall tainted), since those don't despawn, and fill the mob limit. But try to not call it with an * at the end, or it will kill your animals