Angela,
By "hose water," I'm presuming you mean water from your municiplal water
supply rather than from a private well -- even though you weren't that
specific. Almost every public water supplier adds some form of bactericide to
their water, which is toxic to fishes. I did notice that you said that when
this pond was originally filled, that the water sat for 24 hours or longer --
but again, you weren't specific in saying exactly how long after this that
the fish were added, nor do you say how many months (or years) ago this pond
was originally filled..
Most water suppliers that add a bactericide (and that's most of them) now
use a product called Chloramine, a combination of ammonia and chlorine which
locks up as a compound and doesn't dissipate very fast at all. This would
be lethal to fish for at least three weeks or better.
While your water supply may have this compound but at a smaller than normal
concentration -- explaining why these other fishes are still living --
iit's more probable that your tap (hose) water contains just Chlorine, which
dissipates slowly over 24 to 48 hours.
It's more likely that your tap water has this Chlorine especially if this
pond was originally filled fairly recently, and if the fishes were added to
this pond soon after allowing this water to sit for 24 hours (or more).
Still, Chlorine in itself is very toxic to fish -- which is the reason for
allowing it to sit for at least 24 hours so that t has time to dissipate. As
3/4 of this pond may well have been refilled with chlorinated water with fish
being in this water, this would explain the fish deaths that were seen.
After 24 hours, and with the Chlorine mostly dissipated, the stronger fish were
fortunate enough to survive.
I can't say what the black water occurred from, but placing carbon in the
filer would probably have removed it. When doing partial water changes, they
should generally be restricted to about 25% of the pond -- and then, a
water conditioner container chlorine remover needs to be added at this same
time. Call your water company to see exactly which bactericide they add to
their water, and if they add Chloramine get a water conditioner having a
dechloraminator in it..
Ray
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