Bump ... anybody?
Thanks - your eagerness to assist is noteworthy!
I do the WCs just like I always have (since going planted). I don't gravel vac - just suck the water out. I treat each bucket with declor and also the last bucket or two with the daily ferts. As I said, I have done it just exactly like this for weeks. This week it seems to have problems.
It may be a combination of the ferts?!?
Flourish, Flourish Excel (I know, just using it up), Iron, Potassium, Phosphorus, and Nitrogen
I may try dosing 3 or 4 hours after the water change as you suggested. I have been following this schedule for weeks with no trouble - that's what has me puzzled.