I got iy yesterday though so its too early to tell. Looks nice though. I had one before though and they are pretty tough little critters. Mine got sucked into a powerhead and was cut into a third of its original size. I thought it was a goner but it kept on truckin'. Unfortunately it disappeared about 3 weeks later I made sure to keep all my powerheads away from my rockwork this time around.
I have a lettuce Nidibranch for hair algea but for most nidibraches we honestly do not know what they eat! Alot of them die in the command reef tank. I kept a lettuce for about a year now I find them rather easy to keep alive. BioReefer
I got 4 Berghia nudibranch in the hopes of breeding them and to remove some of my 17,000 aptasia at the time.
All 4 of them died within 24 hours.
Not sure why they died, i had perfect water perameters and plenty of micro aptasia for them to feed on.