Actual squid need ENORMOUS tanks! 1000's of Litres and they need very large quantities of live food, as an example I've found over 200 krill and 50 small fish as a single meal in a Southern Arrow squid (of about 19cm dorsal mantle length, it worked out at over 10% of their body weight in a single meal!) They have very specific requirements for tank and plumbing requirements too, eg cylindrical tanks, no pvc, spray bar flow from centre out etc etc etc. Steve & Co know heaps more!
J