Hello, I just recently finished cycling my 7 Gal Planted tank. The ammonia and nitrite were successfully converting to nitrates and showing as 0 within 24 hours. I just recently switched from Seachem Flourish to Tropica Specialised to help plant growth and health. After I realized my tank was cycled, I changed out around 40% of the water, added prime, and I picked up 5 small endler guppies. After testing my nitrite after an hour or so I realized it was at .25 and this morning it is a little higher. What could this be? Is the prime giving me false nitrite but correct ammonia at 0? Could the fertilizer be adding nitrite somehow? My other parameters are. 72 degrees, around 7.4 ph at night and 6.6-6.8 during the day (since I have CO2) and KH at 5 GH at 7.