So, I accidentally broke the topper to my female normal's tank this morning and I've had her out for more of the day waiting for the rubber cement on the repair to dry up but I decided to dump her in my Lesser's tank about a couple of hours ago since I was kind of sick of having her out, thinking nothing of it.

I went back to check the topper a few minutes ago and found them like this. I thought they were just laying on top of each other but I gave their tails a prod to see if they'd come apart and no siry, seems to be a genuine lock?