oHsNaP1337;2951007; said:About 7 months ago I had two FHs divided side by side with a drilled acrylic piece so they were able to see each other clearly. I knew one was a male, and had thought the other was a female, but I was wrong....they both were males and they both were showing the same signs you described, both of them digging, both nest building, swimming side by side along the divider and tail fanning....They are two males trying to out do the other by digging a bigger hole for a better nest and showing dominance by tail fanning each other. In short, they are trying to show a potential female who can build a better nest and who is dominate......
Thank you, that explains the strange behavior.