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I respectfully disagree with Cass on the roo situation only the rest I concure. I would not keep 2 roos in the same coop with only 6 hens especially young hormonal roos. The hens will get overmated and that stress alone can cause you to have no eggs. You don't need a roo to have eggs unless you want to hatch out chicks then you need a fertile roo to mate the hens.
Now if you want to keep both roos then I would put them in a separate coop or area.
The attacking you see is more than likely mating as Cass stated. Young roos will do things like sneak attacks or cornering in order to sow their wild oats. I have two young roos right now that like to sit at the pop door and wait for the hen to come in so he can grab her. Some more timid hens will try to stay out as long as possible because of this. The more forceful hen will take the roo to task which is alway amusing to watch a roo get his hat handed to him.
If you are going to use a light to prolong their daylight hours just make sure that it isn't too bright so they can still settle in and sleep when they want too. I too use a light, although mine is on 24/7. The light is positioned low and over the feed and water, so really all that is lite up is the feed and water. Perches, nest boxes and most floor is in the dark. The girls don't seem to mind the light on and I do get plenty of eggs. We sold 67 dozen last week and have 146 chickens of which 8 are 8 weeks, 2 are 17 weeks (and momma is still mothering), 12 are roosters, and the rest are hens ranging in age from 20 weeks to 4 1/2 (or possibly more) years. About half of our girls are over a year old.
When did you first put the light on? If you waited until just recently then your girls may be already into winter molt/I'm taking a break mode which is possibly why you only had 4 eggs. How did you begin to increase the amount of light? I know many people just flip the light on at some point, but it's better to increase it over a period of time. Similar to mother natures way of getting them to lay. The slower increased lighting helps stimulate them to lay like the coming of spring. I would also look into egg thiefs. Your first two shouldn't have quit like that. Egg thieves range from rodents, snakes, small mammals and of course the ever popular human. The other reason eggs could go missing is a hen/chic eating them. Young chickens not at the point of lay will pick and eat eggs quit often. It's just one of the many reasons to not group all ages together.
Hope you figure out things.
Opps, missed the part where there were so few hens. Listen to the above advice, I know I learned something about how some roos act from her/him. so, Yup, get rid of one of the roos or keep it separate from the hens. Some people have a Bachelor pad for their extra roos, so they are never without a roo. If you don't want to hatch eggs you don't have to have a roo at all. They do taste yummy.
Most advise 1 roo to each 10 hens. I have 3 roos and 15 hens....without problems, so far....but most of my hens are bigger than my roos right now, so they make the roos back down quickly.
Come Spring I am going to get rid of one of the roos and hatch a few chicks to bring my flock into better ratio.