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Discussion Starter · #1 ·
Hi All,

My tank parameters are 0 NH3, 0 NO2, 5 ppm NO3. I do weekly, sometimes biweekly 25% water changes. Over the past week Ive seen some strange deaths. They all happen in the middle of the tank (or thats where I've found bodies) of mostly juveniles. All my babies, i see are crawling around happily, and so are the adults. I have no idea what is happening. As well only one seems to die at a time, and its usually during the night! This is a species only tank.

As well, some of my shrimpies have a more opaque white body. The flesh under the shell doesn't seem clear, kind of like a cooked shrimp. Tank tempeature is 24 (26 when lights are on) is that normal?
 

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What is your GH as it sounds like you have calcium deficiency? You also may want to check your KH\alk as well to make sure it is not 0, which may cause PH swings at night.
 

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Discussion Starter · #7 ·
it is gravel, but i'm pretty sure it is leaching ca2+. GH is above the chart (i can't drop enough to change colour) same with KH. Even after a water change it stays like that. I also have snails in there and i have never seen prettier shells so i'm pretty sure its not the calcium. Ill check with the pH, the deaths only started when my DIY started to run low, i just changed it again. Maybe they were used to a small pH swing at night :D
 

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Discussion Starter · #12 ·
had another single one die this morning. very annoying. i thought at first it could be leftover food and so I've only fed 1-3 pellets for around 40 shrimpies left every other day.. they are practically starving now and no less random deaths.
 

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The water parameters looks good. The only thing I can think of is the PH swing. Not knowing too much of your setup and other factors, chances are the KH=4 and ph=6.8 tells me the CO2 is keeping it below 7. Are you able to take a PH reading 4 hrs after your lights are on and 2 or 3 hrs after the lights are off. This way you should be able to tell if you have a ph swing due to the CO2 running 24/7 and the plants O2/C02 shift. If so, you may need an air stone running when the lights are off.
 

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Discussion Starter · #15 ·
so yes i think it could be a pH issue. I came back from a short vacation and my CO2 was dying however, i've only had 2 deaths according to my friend over 7 days. I came to though hmmm, maybe when my CO2 (DIY) is running well at night the pH must go down as have been suggested and then go up during the day when its used up by the plants. And when the DIY starts dying obviously there is less input at night and so the swings are less drastic... so i'm going to stop CO2 in my shrimp tank.. its filled with low-light plants anyways, I just hope i own't get more algae now.

PS. I tested morning pH as suggested and it was at 7.4 (so i take this as "night time" pH) and then I tested it 2 hours after the light is turned on and it was up to 8.2. This was all in the presence of CO2. I'm going to turn of CO2 and see what morning pH is.
 
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