ok, i have a 20 gallen tank i am settign up, it has everything in it expept fish, filters, heaters, gravel, ornaments plants etc. well i have 7 guppy in a small tank whick i need to move in to this bigger tank asap, but the nitrite level is 0.1 and had been for many days now. any advice on how to lower it ? quickly? it has only been set up for 8 days, i no this is not long but these fish need rehoming, there so cramped. help please anyone