blue/red lobsters

[fishmanuk]

hi all , ive got two blue lobsters both about 6 inch long, i had them in a smallish tank, then decided to get them a larger tank,the old tank was in my other room doing nothing with just a bit of water and gravel in it, i recently sold it a week later but when i went to clean it i found about 20 little lobsters in it, i put them in a tub but 5 mins after they where all dead , does any one no anything about lobster breeding as i cant find anything on the internet