I don't know the number of fish....but it really depends on the sizes more so than the numbers. In most of the photos I waited for many to congregate for the pic so it may appear more crowded than it actually was. The photos were taken shortly after the tank was stocked. Many of those angels (Queen, Majestic, Imperator, Blue Face, Blue Ring), triggers (Clown, Blue-face, Huma) and tangs (Lipstick, Hippo, Sailfin, Vlamingi) grew quite a bit....and still there was essentially no aggression. You can't see it in the photos, but the rockwork was not up against the back of the tank so the fish could swim back there and throughout much of the rockwork. I would give anything to have that Totoka live rock again!!
600 lbs rock; fiberglass tank with rounded back corners, 44" deep x 3' wide x about 6.5'L. When the tank was set up in 1994, I just had four 6' VHO T12's. I later added four 400W halides in large Lumen Brite reflectors when I got more serious with SPS.
A 25 yr old hippo and tomato clown were amongst all the fish I lost because of Sandy. Without a doubt, my most devastating aquarium calamity!! (I could list a bunch more too over my 50+ years of aquarium-keeping!)
Here's one more pic showing a Harlequin tusk: