"Randy" wrote in message
news:3zwIc.74815$XM6.22733@attbi_s53...
LAst night my neighbor was topping off his 7700 gallon pond and he
accidently left the water on overnight he lost about 25 of his 50 fish. I
dumped in some water prep this morning but I wonder if there is something
else I can do to save the remining fish. The whole pond is new water
now.Please help.

First concern is to be sure you have enough dechlor in there. The chlorine
or chloramine will kill the fish faster then will his lack of filtration,
assuming he has killed is biofilter. Being 7000 gallons, it is going to be
hard to dechlor it, so If I were him, I'd get the fish out of the pond and
into a temp holding area. Then do checks of the chlorine, chloramine,
ammonia in the pond. Once the levels are safe, reintroduce the fish.

If the biofilter got killed off, I doubt it, but if it did, he'll want to do
partial water changes until the filter is back on-line. Did I mention
Dechlor?

BV.