This is my fantail darter and he has turned out to be one of the two most elusive darters in my tank to photograph. The other is my adult rainbow darter. He seems to have loosened up a bit and sat still long enough for me to get a somewhat decent shot. For the most part he remains hidden under his rock lair and is fairly aggressive towards others who get near it.
Notice the "eggs" on his short dorsal fin.
Second photo is of the adult rainbow. I had to be quicker than he was to get the shot.