:thumbsup:
I expected this response TBH, I was hoping against hope it would work and i was wrong...
I did find a species of goby, blue, that does shoal, but I lost the link where I found it, and cannot find it anymore. You don't happen to know it?
Zebra Barred Dartfish (Ptereleotris zebra) does well in a group (which must be introduced concurrently) but they do not shoal even though they are semi-social. These are often incorrectly called gobies.
Otherwise I'll just drop the idea of a shoal.
I'll see when I get to it, but I'm inclined to follow your advice and get 1m 4f of flasher wrasse.
The reason will be obvious if you do so. The male will court (displaying nuptial coloration) each of the females; a display worthy of photographing and is why they are called flasher wrasses.
No, thought not, as I said it was a last attempt to have a shoal in my tank...
Ok, I'll leave the dead horse alone.
The only one I know of that will result in the effect you want (in your sized tank) is Apogon Parvulus as mentioned previously. Everyone wants this effect, it is just not reasonable in normally sized tanks and most try it with chromis or cardinal fish unsuccessfully. In huge tanks, glassy sweepers will shoal but we are talking thousand gallon+ sized tanks. People often conceptualize that anthias will shoal, but they do not really do so; the male will herd his females but the natural behavior on the reef occurs primarily when the current is running and plankton is in the water column.