that's a lot of fish in a small tank! get rid of some males mate. you dont really want more than two in that tank, id keep one but competition should stop him being lazy with the girls... i keep 2 males only ideally with 5-8 females in a 10x3x2 on a huge system and they bred like rabbits. home made food(prawns, mussels, squid, spirulina, nori seaweed, spinach n white fleshed fish blended up n frozen in snaplock bags).