I totally agree. My observation is in the basement with no traffic and I also black out the ends and back of the tank at the beginning. I think another important factor are tank mates in the DT. For a CBB to survive in a tank full of aggressive eaters they have to be willing to get in there and compete or they will eventually starve over time. I have a hunch the one's successfully added directly to a DT may be stocked with smaller less aggressive eaters vs larger hungry fish like the tangs in my tank above.+1 on observation tank. I’ve had the most success with starting them in an observation tank with low stress and activity. I think you can be successful introducing directly to the DT, but it has to be mature with lots of worms, aptasia, etc so the fish has stuff to pick at until it learns to eat from the water column.
Another thing I've found very helpful is when they are ready to be introduced is to place them in an acclimation box. I use a reptile carrier that I put holes in. The holes are large enough to let food fall through. I feed the box so the CBB gets plenty of food. All the other fish go after the food coming out of the holes and it gives the CBB the illusion it is competing with those fish for the food. I think it helps build confidence. All just speculation on my part based on my limited experience. After reading about so many of these beautiful fish dying by being placed straight into a medicated QT or a populated DT I decided to try my hardest not to let that happen.
Im not a fan of white pvc like so many use. I add some of the rock from observation to the acclimation box to help make it a more natural settings.
I probably over think it but I've been keeping some type of animals my entire life and I feel I am responsible for their wellbeing if I bring them into my home. If im not able or willing to provide that care I will choose an easier to care for fish. JMO
EDIT to add a pic of my last observation tank.
