cycles are not that defined. often times people think their cycle is over and then have a massive HA outbreak. My only suggestion is to let it run its course. It is painfully tedious and boring but wait it out. Go ahead with your plan, but I am skeptical that you really even need the squid. That algae is most probaly just the very beginning.
Let it run for a couple of weeks and monitor water quality. Then put in a couple of very hardy small fish that you would like to keep. Let them live in the tank for a couple of months and then assess the situation. It's so hard not to rush, but extremely important that you don't.