He/she is in a babie tank that floats inside the main tank with her 4 siblings, and is considerably smaller than the others. I think it is not eating as much as the other 4 and I am worried!!
There are always runts in my batches, sometimes it's just a feeding question and sometimes they grow lots slower then the others... I've never been concerned, maybe cause there are always many more on the way and if that one dosen't make it then it wasn't meant to be.