Can daphnia become toxic?

katie11122

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Can daphnia become toxic?

I had a daphnia culture in one of my little fish tanks to feed my babies but when they moved onto bigger food I tipped them out and gave the tank a quick clean with water and paper towel. I then had housed a tropical fish in it for two days she did go a little pale but i assunmes she was adjusting to her pale environment. after that i again washed the tank and put it back into storage. Now that the babies have their front legs and back legs (almost) I thought I would put them into the tank for a little more room. I gave it a rinse out and filled it up, tested and balanced the ph etc. later that night I popped my babies and some black worms into the tank, they seemed fine but a few hours later all of the worms had died and my babies were floating and on their backs………. Quickly I scooped them out and put them in their old container with fresh water and thankfully they have made a recovery! I’m always mindful about soap etc on my hands and other contaminants. My question is could the daphnia have contaminated my tank? Could it have seeped into the silicone or something???
 
Daphnia are used in water quality and pollution testing. They die when water gets nasty, so, no it wasn't the daphnia.
 
Hmmm i will have to think back some more then to figure out when and how the tank became contaminated!

thank you so much for your help !
 
The tank was contaminated by the dead blackworms fouling the water. Are you sure they were blackworms, not bloodworms? Blackworms are aquatic, and even chopped, last a fair bit under water. Bloodworms come frozen in cubes, or occasionally live.
 
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