All my hornwart died in the last 3 months after YEARS of thriving in my
pools, ponds and tanks. It's not always easy to find here. It just stopped
growing in *all* the tanks, looked sicker and more miserable until I tossed
it. That's another thing that's really weird. What would make all the
hornwart suddenly fail? I bought the original clump back in 1989 when I was
living in town.

Just like a car engine needs fuel, spark air, plants need light, food
and water. It didn't have one of them. Given you have algae I'd say food;
it stareved to death by running out of some nutrient.

I'm not aware of any chemical naturally (or unnaturally) exisint
in water that will kill hornwort. For example mosses are very sensitive
to sulphates. I've never heard hornwort is - doesn'[t mean that's the
case,I've just never heard it.

The small amount of green algae doesn't bother me in the other tanks. It's
the tank with the blackish red sooty crap that's got me bugged.

Excel should turn this white almost overnight. Despite the warning not to you
can safely double dose. There's a healthy safety margin built into this
stuff.

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