I have 8 fish in QT. 5 Clowns, 2 True Perculas small; 3 Ocellaris - Tank Bred (Europe), in a 20g. Also, Blue Tang, Solomon / Fiji-Tiny; Chevron Tang - small;& Archiles Tang - medium, in another 20g. My question is is one - two weeks enough for QT? They all are eating real good and look very healthy, The one tank has high off the chart Nitrites, even with 20% water changes every other day! Time and all. These very good looking fish will be going into a 125g with soft and hard corals and a Sailfin Tang, 2 Firefish, one Lawnmower Blennie, and one Black Blennie, and hundreds of Crabs, Snails, & Turbos.