I’m doing a fishless cycle on a 75 gallon tank & had a question about the nitrite stage of the cycle.
75 gallon, Fluval 406 & Fluval 206 canister filters, two Eheim 200 watt heaters, two 8″ bubble wands, medium pebble substrate. No plants or fish. Tank temperature during cycling: 88 degrees F.
I’m about 19 days into cycling and am dosing the tank with pure ammonia daily. About 4 ppm declines to 0 ppm in less than 24 hours. My nitrites are off the charts high – using an API kit, the water turns purple before I even shake the tube. Nitrates are between 5.0 ppm and 10.0 ppm. The nitrites have been spiked for about 8 days now.
Is there anything I need to do at this point to get the nitrites to come down? It seems to be taking a long time – or am I just being impatient?