[mike31154]

I just purchased a second Mandarin as well, real tiny juvenile and don't see him/her? much. When I do catch a glimpse, I can see it eating, so all good. Your tank is huge so if it's a tiny juvenile like the one I just put into my 75, he has plenty of hiding places. I wouldn't be too concerned if you can see he's eating and watch him in his sleeping quarters.

I may have made a boo boo since I thought I had purchased a female for my now fat & happy male which was introduced a few months after I started my set up. Eyed the little newcomer at the LFS for a good 20 minutes to see if it had the prominent, spiked dorsal fin peculiar to the males and it sure looked like it was just a small dorsal, aka female. Once I got it into my tank and had a closer look, it appears the little bugger is actually a male and when he had raised his dorsal at the LFS, he only raised it half way, the spiked part was sort of folded over. Fooled me and the LFS employee, who didn't know much about the species... it was labeled as a Mandarin goby on their tank.

Don't wish to hijack the thread, but now what? So far so good, since the two met the day I introduced the newb juvi and didn't get into any battles. Just a little fin displaying and the larger resident sort of nudged the newb around a little. Nothing serious, probably because of the huge size difference between the two. Still hoping somehow that the newb might be female, but I doubt it, so eventually I may have to take the little fella out. Anyone have any experience with two male Mandarins in a medium size tank?