OK, IN the time that my internet has been down, i have introduced 12 more pygmy cories into the 35g, bringing the total to 20.
What i'd like to know it how to tell if they are mating. When i introduced the new ones, they all went a little bit nuts, swarming around the tank and then partnering off in to twos (and sometimes threes) and the smaller of the two would kind of bend around the larger one, curving it's body in a pronounced manner, whilst kind of twitching. This lasted a few seconds and then they'd go somewhere else and repeat the process.
There were about 4-5 pairs doing this at any one time, but i'm not sure if it was always the same fish, as everyone was kind of mixing and matching. I can't see any eggs knocking around (although to be honest i don't really know what i'm looking for) and even if there were, i'm not expecting much of a result, as they are in a community tank with Emporer tetras and Kribs, both of which seem to me to be quite good egg-hunters (not to mention the yoyo loaches...)
I'd just like to know what they were up to!