Agreed that its not too much flow -- my only fear is the laminar flow a K4 puts out in a tank with these dimensions.. A pair of K3's might be more manageable. This will be fun to watch grow -- you're definitely off to a very strong start... Not often, unfortunately, that people put this much time, effort and commitment when getting into this wonderful hobby

Another note/question: you stated 2x39w for your lighting... Are you planning an upgrade before taking the coral plunge? While i'm about the biggest proponent of T5 lighting you could find, this isn't going to be enough light for upwards of 75% of the corals available commonly in the hobby.. If you're planning on adding a MH pendant or 2, the T5 will be great actinic supplement tho

-Justin