In message , Reel McKoi
writes

"~ jan" wrote in message
.. .
What a lot of ponders/gardeners miss, is that one can add all the
iron, but
if the pH is too high for that plant to take it up, it won't help.
snips
============================
I'm pretty sure this is my problem. The PH goes from 7.8 to 8.2. I
leave it as is as I don't want to get into the PH yo-yo syndrome. The
fish have adapted to the high PH but the plants aren't always too happy.
I think I have a similar issue really, pH 8.0 - 8.5, but stable and the
fish are happy, so I leave it be these days.
--
steve