Can Cardamine be a Killer?

baldbrit

Registered Member
Oct 9, 2006
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A couple of months ago I bought "Cardamine - Creeping Charlie". It grew a little ragged and it's leaves had a habit of rotting, but otherwise it grew OK.

A few weeks ago I added two swordtails to my tank (26 gallon, already had 2 Dalmation Molly and 2 Mickey Mouse Platy). Within 48 hours the male swordtail was going crazy, and then died overnight. The female sword laid there for a week then died. Last week I tried two more swords bought from a different shop, and the same thing happened to the male sword. Dead within 48 hours after swimming extremely erratically.

The new female sword also laid there for a few days and I was assuming I would lose her too, until I needed to remove the Cardamine. It had grown so ragged that it looked awful, so I removed it all. The next morning I found the female sword swimming happily and wanting to eat. I also noticed that the other fish were swimming around much more than they ever did.

Is this all coincidence, or could the Cardamine have killed the swordtails (and subdued the other fish)?
 
I have Cardamine lyrata in my tanks -loads of it now! I've never had any trouble with my rams or barbs or kribs, neons, cordys, bettas eating it - it may be different with swordtails though.... As far as I know it is used as a herb (like Parsley) by humans, so I would guess the problem isn't to do with the Cardamine....
 
I just googled 'Creeping Charlie - this is in fact a plant called(Glechoma hederacea)' which looks a bit like Cardamine lyrata - common name- Chinese Ivy. This 'creeping charlie' is a different plant altogether. Sorry, I've never heard of this before. If I were you, I would do more Net research on Glechoma hederacea before you put it in your tank again. In my experience true Cardamine Lyrata is a fantastic addition to an aquarium, though.
 
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