Can you tell if they are eating? Have you tried BBS with them?
I fed them cyclopeeze and phyto or photoplankton (freeze dried) which ever one - it's redish in color. I am thinking they are better protected from any predators in the in-tank-refugium. One looked like it wasn't going to make it last night, but this morning all 8 looked great and in a tiny little school. I do see 3 in the overflow...I may get a net and get them out - hopefully the chances of survival will be great considering I have a good number of them.