Male rats don't fight with each other, and actually rats get lonely without another rat with them.

Even with a bunch of holes soldered in that lid, there is not enough ventilation for your rats in that tank. Go to the pet store and get a screen lid and some clips to hold it on. You'd be amazed at how high rats can jump..

Oh.. and it's only a matter of time before the rats chew through the duct tape and make your water bottle fall down and possibly leak all over (or you'll just have some thirsty rats) You can buy water bottle holders that are designed to hang over the rim of tanks.

Hope this helps.