I have a duncan head that is not looking good. Its a 4 headed colony that I got in August. Its been been happy ever since until yesterday (12/4/19). The parameters have been stable. 1.026, 425, 1350, 7.15dkh, PO4 1ppm(I will be working on dropping this. Its never been higher but it has been lower. Sometimes its low other times its high), NO3 10ppm, 8 PH, 78 Temp. I will be doing a ICP test before and after my water change.