I've used TT a few times and agree. Unless you have too many fish, or an "iffy" diagnosis; TT is easy and idiot-proof. Ich is really easy to diagnose, once you've seen it. (Often much easier in person than from pics.) FWIW; just judging from the number of ich threads vs. velvet threads on RC; I think velvet is often being missed or fish are dying before being posted on RC.