Hi people this picture i am presenting here shoes the musualism was talking was talking about the plant and the fish on the lab they both benefiting from the relationship without harming each other  .  This  also show what is we call a biological filtration, they is use of living plants and nitrogen loving bacteria that keep the habitant of a fish cycled. I refered to it as a cycled tank because it has finished its nitrogen cycle , proper managment of ammonia and fish does not suffer same in an uncycled system.