Who Gives A Fish Forums

Hey everyone, so I just moved my torch from my old 20g to the new 75g rimless. Tank was cycled beforehand, of course. Here are my current parameters:
Ph: 8.3
Sl: 1.025
Alk: 8.7
Ammonia: 0ppm
Nitrite: 0ppm
Nitrate: 0-5ppm
Phosphate: basically 0ppm (running GFO and carbon, test's unreadable)
Ca: 420 ...

It seems like no matter what, I always get a response in this section

I didn't get any response over there, so I thought I'd try here and looks like I got a response this time.

How long till the eggs hatch then?

Anyone else have a kerb like this, super protective of their castle?

My male kerb's really protective of my castle, won't let any other fish swim by without chasing them off, while the female stays inside. I've never seen this behaviour before, is it due to breeding or is there something else at play here?