About all I now for sure is that they eat flatworms.
As a whole many nudibranches don't live long, and of course there is the dangers of powerhead, overflow, and even the occational grab from a brittle star that could take thier life. Then there is the shipping suvival issue.
Then if there are no flatworms they could verywell wind up dying on me, but I prefer the natrual approch on this issue.
I'm still learning, this is a new experience for me. I have a 90 gallon loaded with these little punk red flatworms, we shall see how long it takes them.
So far I have found that one is an active hunter, the other (no pun intended) is kinda sluggish
I have noticed one that make some kind of cocoon for itself the first night. Haven't seen it do that again.
Will keep you posted.
Thomas