I have two ancistrus sp.3 in my tank - I've had them for around 10 months now. Now and again theyll have a bit of a scrap over an algae wafer at feeding time, but apart from that they don't pay much attention to one another.
I have just put some flakes in the tank, and as usual they came to the front of the tank. Anyway, next thing, they had locked lips! They kept doing this, and then started circling each other closely, locking lips inbetween times. They carried on doing this for about ten minutes.
Has anyone ever seen this before? Was this just a fight, or were they getting jiggy with it?