Cheers, both marbles actualy lol, your lucky mine seem to be stupid as hell, the asmount i have to feed for then to nitice any food is there, if i try and hand feed they get scared and swim off cant win!
Funny you should ask that, ive noticed every now and then the seem to shimmy together and the smaller one nuges the rear end of the big one, they then do laps of the tank side by side, i watched for hours hoping to see something but nothing happend? so im not sure.
Sounds like shows of dominance, common in gars. I have never seen gars breed in captivity except in huge outdoor ponds (tens of thousands of gallons), and these were in South America.