i bought a new tank 2 days ago......a juwel rio 180 (180 litres) and i put some media in the filter from my 190litre tank......my readings today are..... ammonia 0ppm , nitite 0ppm and nitrate 20ppm. Has my tank really cycled this fast? My 190litre tank is well matured but I have never had a tank cycle this fast!!! Your opinions would be welcome. thanks.xx.