The flowrate that you want to aim for differs greatly depending on what type of tank you have. (fowlr, softies, stonies, etc) 50x in a fowlr tank is a bit excessive. 15-17x is quite common. Ive even seen tanks that run around 12-14x. Of course if you have high-flow corals, these flowrates wont suffice, but like i said before, it differs. As for the cyano, just as everyone else is saying, ride it out and youll be fine