Fish dead - what now!

[MatthewShaw]

Tank: 36" x 12" x 12"
Containing: 11 Neon Tetras, 1 Catfish, 5 Platys, 3 Angels and 3 Clown Loaches.
Water tests: ok

I started my aquarium after xmas and gradually built it up to house the above fish. About three weeks ago I noticed what I suspected as Finrot on a Platy. (Ragged fins) Gradually other fish came down with the condition, some developing ulcerations around the fin area. I treated the tank with finrot and fungus treatment, but within a week all my fish are dead.

Some fishes had ragged fins and ulcerations, some had no visible faults whatsoever. I've maintained weekly water tests which have been very acceptable for amonia - 0 nitrates, nitrit, ph, high range ph and general hardness. All tests have been ehat they should be.

Does this sound like new tank syndrome?

I first intorduced the Tetras, followed by Platys Catfish and Loaches, which were followed a fortnight later by the Angels (and the first feed of live food!) it all went down hill a couple of weeks after this.

How do I start again? - Do I need to disinfect the tank? if so what's the procedure?
Can I keep my plants? - the only thing alive!!!

Your help greatly appreciated.

 

[Magnolia_360]

Did you add all those fish right after each other?

 

[Adrinal]

There are lots of hard to detect things in water that are "acceptable" for humans but not for fish... It is hard to tell if perhaps it was something in the water...
It might have been your water changes?

We would need lots more documentation of your practice to figure it out... Infact... probably wont be able to...
Because you had a desiese in there for sure... I would... yes... get out the pot and start boiling everything for 20 min.

start fresh... this time document (on a thread here if you like ) step by step.

FYI there has only been 2 months since xmass... if it was a new tank for me I would only be on my first fish! Most folks here go faster than I ... but it is 6 weeks if I am starting with compleetly new material, before I add my first fish. 1 month min before I add another. another month after that... (schools of small fish all at once... but only one kind!)

 

[Loveless]

you could eat the dead fish

I would do daily water change and add melfix after each water change. make sure you treat the water though

it seems to me that you have been ill informed about cycling so I suggest reading the pinned topics at the below link
http/fish.orbust.net/forums/index.php?showforum=26