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- Path: sparky!uunet!caen!sdd.hp.com!col.hp.com!howardr
- From: howardr@col.hp.com (Howard Rebel)
- Newsgroups: rec.aquaria
- Subject: Re: Tank Mysteries
- Date: 31 Dec 1992 19:01:54 GMT
- Organization: HP Colorado Springs Division
- Lines: 74
- Message-ID: <1hvg32INN99l@hp-col.col.hp.com>
- References: <yLqmwB1w165w@kunikpok.UUCP>
- NNTP-Posting-Host: hplsdum.col.hp.com
-
- rg@kunikpok.UUCP (R.G. Keen) writes:
- > 3 tanks, freshwater, all stable for a couple of months. Left tanks
- > in care over the holiday. We cleaned them before we left, checked Ph
- > & ammonia, did a periodic water change. Neighbor competent, no fish-
- > keeper, not a fool either. all the fish in one tank were found dead
- > the day after we left town, except the kuhli loach...about 28 hours
- > after we left them alive and well. Both other tanks were fine. The
- > death tank had a high ammonia level but Ph was 6.2 when we returned
- > after a week. The kuhli recovered after the neighbor put him in another
- > tank. All the dead fish were bloated. What killed them?
- >
- > think two things are possible - either the neighbor poisoned them :^)
- > or something about the cleaning and water change did them in.
-
- The cleaning might have done it; or several other things.
-
- > [specs about water preparation for the water change, quite thorough &
- > seemingly correct--same water was also used for other two tanks]
- > I don't think the water did it.
-
- Small chance, if your city water supply comes from more than one source.
- Locally here, they use both resevoir & wells; with wildly different Ph,
- hardness, etc.
-
- > One expert says that a dead spot in the filter under a rock might have
- > caused a collection of H2S which we released in the cleaning, & this
- > may have poisoned the fish.
-
- Very probable, if one only uses UGF (under gravel filters) only in a
- tank.
-
- > We did a relatively thorough cleaning
-
- Really disturbed the gravel bed, made the water murky enough you couldn't
- see anything in the tank?
-
- > and had to return part of the siphoned water to the tank to
- > avoid changing more than 1/4 of the tank. Any ideas???????
-
- That also didn't help, especially if you made the water extra murky.
- Stirring up a UGF once it's well established causes problems.
-
- If you only made a hash of the one tank while doing the water changes,
- an alternative would be to use a little water from another changed tank
- (not highly recommended); or grit teeth & change more water than one
- originally planned on.
-
- Putting back visibly dirty water has never had good results....
-
- The other reason (maybe) for the ammonia spike is that the gravel was
- messed up too much & the bacterial 'bed' was disturbed--that will cause
- everything to have to start all over again, filter wise.
-
- Ammonia is one of the fastest things to kill fish....
-
- P.S. We've also found an UGF to be a time bomb waiting to happen; once
- one hits about a year; even with regular gravel siphoning. You might
- want to consider another form of filtration for long-haul fishkeeping.
-
- > Mystery #2: One of our tanks has a mat of fungus, whitish gooey
- > threadlike mats in the top 1/2 to 1/4" of the gravel bed. The fish are
- > OK, and the water tests normal, but it's hard to clean since the mats
- > have to be broken up. What is this stuff, and what sin did I commit to
- > have it visited upon me????
- >
- > Many thanks for any information.
-
- Dunno. Are you overfeeding?
-
- [Disclaimer: everything above is the ravings of only one person, who's
- lost enough fish to mystery plagues....Howard's Wife Deb]
- --
- Howard Rebel hpcsos.col.hp.com
-
-