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Old 07-12-2011, 02:00 AM   #1
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Unhappy i haz a sad, a big sad :(

pwc on my 4ft fry tank on the weekend, all good.
last night done a small clean to get rid of excess food so i could move the clean CC sand to the other half of the tank and leave the other half bare glass bottom to feed down that end.
it stirred things up a little, the fry got a bit scared of all the activity but seemed fine afterwards

today i wake up, all my 8 astatotilapia latifasciata fry are stuck to the filter intake, dead.

not sure what killed them, theyve been going so well right up to feeding time last night, looking very good and healthy, strong appetite, swimming and playing with each other.

nearly 3 mths worth of raising them to this point, and now theyre all dead.

im so bitterly frustrated with myself
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theyre fully cich'lid, bro!
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Old 07-12-2011, 04:44 AM   #2
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1 survivor, as fit as always.

7 dead. eyes bulging out a fair bit, lips pouted.

they measured a shade over 2.5cm / 1"

im thinking it was when i moved the CC sand, pushing it to one end of the tank, which happened to be the end nearly all fish were hiding at.
i know one fish definately hid near the filter, which was the end i was clearing.

could it be they somehow choked on sand that was kicked up ?

pisces natural products, micro crushed coral sand
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Old 07-12-2011, 05:10 AM   #3
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How long has the tank been setup? Over time, toxic gas pockets get formed in the substrate, so they could've been released when you stirred up your substrate.
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Old 07-12-2011, 05:44 AM   #4
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Quote:
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How long has the tank been setup? Over time, toxic gas pockets get formed in the substrate, so they could've been released when you stirred up your substrate.
Seconded to this
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Old 07-12-2011, 06:13 AM   #5
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Quote:
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How long has the tank been setup? Over time, toxic gas pockets get formed in the substrate, so they could've been released when you stirred up your substrate.
I don't have a explanation but the gas pocket killing fish myth is right up there with Santa Claus and the Easter Bunny. Sorry about the fish.
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Old 07-12-2011, 06:24 AM   #6
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I agree Hukit. Potting soil tanks often form gas pockets causing the tank to burp regularly in the first couple months of setup. I think it would take a crazy massive gas bubble to mess up the water so much that all the fish would die.

I'd lean more towards your water change procedure, did you temp match the incoming water? I see you are using CC, is the tap a huge ph/hardness jump from whats in the tank? Fry can be very sensitive to change.
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Old 07-12-2011, 07:18 AM   #7
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i set the tank up about 10 days ago using substrate, filters, heater, airline, ornaments, from my existing 2ft tank.

the fry were in it for about 7 days, levels have been fine on w/e when i did 25% wc, it gets little vacuum's every 2nd day with just a wide hose off my siphon, picks up the excess fry food from the substrate nicely without taking much water.
so water loss last night was so minimal i didnt replace any. (it was just an after feed mini clean)

last night i decided to move the ccsand down one end, so i can feed directly above glass bottom, making cleaning it all out a little easier.
they decided to rush down that end and i think they copped the wash as it was stirred


i think i was a bit rough with moving the sand, while my other cichlids never mind in the main tank i think maybe the fry were more sensetive to the particles which take a while to settle.

i checked levels a minute ago, no amm or ni, or na, due to pwc on weekend.

edit: i had 1x 10kg bag of sand in the 4ft tank (about 1" deep) which is about half what i'd normally use.
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Old 07-12-2011, 08:47 AM   #8
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This is a new set up so there's nothing to disturb in the substrate, especially with 8 fry. I killed 9 cherry barbs yesterday after forgetting to turn the filters and heaters on after a water change(first time for that one), there's lot's of possibilities from temp change to huge a huge swing in PH. Luckily moutherbrooders breed very quickly so within 30 days you'll have more.
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Old 07-12-2011, 03:46 PM   #9
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is that a malawi? "astatotilapia latifasciata"
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Old 07-12-2011, 03:58 PM   #10
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is that a malawi? "astatotilapia latifasciata"
They're from Lake Victoria in Rift Lake Valley.
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