For Christmas I built a new 9 level rack and have four 41 qts, four 32 qts, and nine 15 qts. I've had my breeder females in their new tubs for the past few days and reintroduced the males tonight.
A few minutes went by and I heard a chorus of tapping going on while cleaning the other rack's tubs. All 3 pairs had the females wagging like crazy. I caught a bit on video, but missed the 3rd couple in it.
Apologies if you catch me botching the video embed here...
https://player.vimeo.com/video/197572199