So I have 75 with a pair of clowns, a flame hawk and a Pygmy angel. I want two add a yellow and hippo tang. I was thinking 1 1/2-2in a piece. Should I add them together or put one in first. (Before people start freaking out I'm upgrading to a 180 next year it's going to be my wedding present from my future wife) those tangs should be good for awhile in there correct? Or do you think that's too much of a bio load?