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Re: [APD] Sudden death of all the healthy yamato shrimp

I believe Liz Wilhite wrote this email section below:
> On 6/27/06, Ng Heng Ghee <THGNg at ntu_edu.sg> wrote:
>> My new stocking density is:
>> - 50 Yamato shrimps
>> - 10 Malayan shrimps
>> - 15 Cardinal tetra
>> - 10 Harlequin tetra
>> - 5 Rummy nose tetra
> That's a lot of livestock for a 80L.  I have a 70L with 9 neons, 3 yamatos
> and a full tank of plants.
> After some feeding, I switched off the light at around midnight. Both
>> shrimps and fishes look fine and active.
>> No distress was observed.
> It is likely that your oxygen level was pretty low at that point --
> especially if the plants were not in place for a full light cycle -- and
> bottomed out during the dark period due to the plants taking up oxygen along
> with the fish.  Your test results and solving the problem with surface
> agitation all point to oxygen deprivation being the problem. 

I agree too.

I always tell new Aquarists that its good now and again to take a look at 
their tank late at night at least once a month.

It's surprising how often you can spot problems early this sway.

I learned the hard way too a couple of years ago when I couldn't sleep one 
night and went downstairs to discover my fish gasping at the surface and 
starting to die due to lack of oxygen.

I had stupidly added a liquid nitrate remover 1 hour before lights out 5 
hours before.

I lost a number of tiger barbs before I could get enough oxygen into the tank.

Now I always have a air stone timed to come on at night just in case.

Stuart Halliday
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