Heather wrote:
Interesting question. I have the same problem except we have little sun so
attributed the problem to that ...

My pond is 1800 gal
Nitrate and Nitrite are 0 to just tinted on the color scale
pH is 7.5 - 8
Ammonia 0
Fishload - 25 GF of which the biggest is 4 to 5"
Partial water change every three weeks
Water temp 65 to 70

"Mike Miller" wrote ...

My 2 yr old pond ... 500 gallons, full sun, z5,
readings always within range, ammonia and nitrate always read zero, never
any suspended algae, but SA, clear water, under my fish load, don't feed
them, lots of plants of all types, 75% coverage, K, iron and magnesium
(low in my area) added regularly, the K weekly along w/BZT ...

Mike, what are your test results?
Heather, have you measured KH and/or GH? After I checked my KH and found
a really low amount, I've been adding baking soda over a two week
period. After just a few cups of baking soda, all of the pond plants
started growing and greening up.
Mike, is the "K" potash? I was planning to add potash to our pond, but
am holding off now until I can get the KH up to a better level.
--
Zk (sig. compliments of BV)