Thank you for the reply. The first 3 weeks that this tank was up there was no fish in the tank .. Only rocks and filter from a previous well cycled tank at about 3 and a half weeks I started adding Mollies.. Fish have been in this tank for about 4 weeks. I thought the old rocks and filter would...
I have a 40 gallon tank with 6 Mollies. This tank has had fish in it about 4 weeks and had a 3 weeks fishless cycle before adding anyone. I over the weekend had a very slight amnio raise. That is now gone. Now nitrite and nitrates. What should I do?