It has been abort 7 years since I passed my Bristlenose breeding colony along to another aquarium club member. So the amount of days escapes me. When i was spawning them the main male owned a cave in a piece of bogwood. I could not see into it too well, so I just let it happen. I did see a few of the others use a pvc
, but by the time they were spawning, it was a constant cycle of fry in the tank. I was selling bags every month in the monthly meeting auction.