hi, im a new fishkeeper and ive had the tank 8 weeks now, i have a 54 litre tank,it has a 150w heater and 360 litres per hour filter, the tank has 1 small angel fish, 1 cory, 2 male sunset plattys, 2 female micky mouse plattys, 2 female orange plattys, 3 black phantom tetras, 4 male guppies, 4...