Had a wee prob a couple of weeks ago myself,prob was my nestboxes are all identintical and the cocks were getting mixed up with their own boxes and were fighting with each other when in th wrong nest box,seeked advice from my dad and he advised me to keep every second nestbox half shut with the door open,worked a treat just goes to show for us novices ask the experienced flyers and they'll do their best to help us,thank god for the experienced goys eh bud?atb kenny