BN Plecos Spawning!???

Is this a sign that my BN plecos are about to spawn? I had them about a year, maybe longer. I got them from two different people. The male has been in the "cave" for the last few days. He's pretty aggressive. I saw the female in there once, but nothing happened. Does it look like she has eggs. The female is an albino long fin. Male is Brown possibly calico x brown short fin.

I have had the PVC cave for a while, he wasn't interested in it ever, around 6 months. I have a driftwood that has holes in it and he used to hang out in there, but for the last few days he's been in the cave. I think that she's female because she doesn't have the U or V shape like the male Albino BN I have.

Better Pic of her:


Here is a better picture of the male:


This is how my albino male looks:

Okay is no fry yet... Here is what they are doing right now.

Okay, thanks for the tip. Do you know where I could find those caves for a good price?

Thanks a lot.