NO WAY! You cannot keep any fish in a tank that small (Although some people would argue a goldfish and betta can) (Perhaps a betta).
Try and look at buying a tank thats 15-20G. The sizes might range from 24"x12"x12" for a 15G. Or 30"x12"x12" for a 20G. You can pick these up cheap, try looking on ebay, wont pay more than 30 bucks. The minimum tank to breed rams would be a 10G. Bigger is better.