@PiDo
No worries, wash or wipe it off and keep going.
You might add some details of your cycling process so we may help.
Cheers
OK! My setup is:
10 US gal tank
Substrate is 7.7 ltr Flourite Black Sand
Plants: Marsilea crenata, Pogostemon erectus, Rotala Robustus Mini, Rotala rotundifolia from ABC Plants
25W water heater
Filter is Fluval 207 with 3 baskets full of lava stones
Water temperature maintained at +/- 25.6 C
Every morning I test water for Ph Ammonia, Nitrite, nitrate
Started adding ammonia to 4 ppm on day 8
Since then ammonia level is 0 ppm after 24 hours, nitrite goes UP to 5+ ppm and nitrate went to 15 ppm and dropped to 0 ppm on day 17
So I did a 10 ltr water change which lower nitrite to 2 or 5 ppm
Day 18 (today) ammonia level is 0 ppm, nitrite is 5+ ppm and nitrate is 5 ppm. Also I did a 10 ltr water change which lower nitrite to 2 or 5 ppm
I don't think I have cycling problems but should I add more ammonia or not and do more water change
In the 70's we didn't bother with cycling. So trying this method is a bit frustrating
Meanwhile plants are growing fast and shrimps will have to wait