can't keep my daphnia alive....
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Old 06-15-2013, 02:02 PM   #1
jovonhaln
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can't keep my daphnia alive....


I have a 1.5 gallon plastic tank taller than wide (maybe 12" 7") I fill with aquarium water when I buy daphnia. For some reason I can't get them to grow. I use 1 quart of water with a half teaspoon of yeast for food adding only two or three drops per day to the culture. They still die. the temp is 76-80f the water is from my discus tank so it's about as clean as I can give em. ph: 6.8
gh: 7 or 8 drops api test
kh: 5 or 6 drops api test
I don't have my cards handy for the conversions no ammonia, no nitrite and usually 5 or less nitrates sometimes the phosphates are up but I don't test for that often. I do approx 20% change every other day.
What am I doing wrong? Oh.. I also have them on a 12 hour light cycle hoping for green water... none so far...advice?
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Old 06-15-2013, 03:26 PM   #2
mistergreen
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Try a bigger container. They'll need more than yeast. Try a mixture of gluten-free flour, spirulina, and a dash of yeast. You can make green water in a milk gallon jug and giving it sun light. Make sure it's not boiling hot or nothing will grow.

Heat is also important for the daphnia. They like ~70F, depending on the species. You can get away with higher temps for the smaller, moina sp.
Oh, if you're using chemicals like excel, stop. It will kill them.

http://www.livefoodcultures.com/Daphnia.html
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Old 06-15-2013, 05:21 PM   #3
seanski21
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I have daphnia growing in one of tanks that's outside. I do not feed them, in fact I'm not sure how they got there. They seem to just fine on the rotting plant material that is in the tank... so maybe you can try to add some dead leaves to mix as well. And as a side note the ammonia in the tank is around 2 ppm so they are pretty tough when it comes to that... perhaps your environment is too sterile for them.
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Old 06-15-2013, 06:42 PM   #4
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the guy I get my daphnia from says the same he has a tank outside and never does anything doesn't even bring em in in the winter... must be the green water. He gave me the idea for the yeast & to be honest he said feeding is optional and often is more harmful than helpful.
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