Rohan Patil Posted November 25, 2020 Share Posted November 25, 2020 A cory had crossed the rainbow bridge when I looked into the tank this morning. She looked bruised. No white spots or anything. I added some new fish (purchased from Aquarium Coop local store) yesterday night. pH - 6.4 Nitrates - 5-10ppm Hardness - 2 Nitrite - 0 Ammonia - 0 KH/Buffer - 2d Water Temperature - 74 1 Link to comment Share on other sites More sharing options...
FrozenFins Posted November 26, 2020 Share Posted November 26, 2020 The ph is a low for the corydora, corys like at 7-8ppm. I don't what could have caused the fishes death, sometimes these can be the toughest of deaths. Link to comment Share on other sites More sharing options...
Maggie Posted November 26, 2020 Share Posted November 26, 2020 12 hours ago, James Black said: The ph is a low for the corydora, corys like at 7-8ppm. I don't what could have caused the fishes death, sometimes these can be the toughest of deaths. Hi James, do all corys like pH over 7? I would like some for my main tank which is 6.6. Link to comment Share on other sites More sharing options...
MEWaters Posted November 26, 2020 Share Posted November 26, 2020 is this from Dean's Peru wild stock? If so, that pH shouldn't be an issue unless a major swing from ACO? any more of them in tank? doing ok? raise temp a hair? Link to comment Share on other sites More sharing options...
FrozenFins Posted November 26, 2020 Share Posted November 26, 2020 @Maggieyou can always buffer the ph. you can use crushed coral to increase your ph. Link to comment Share on other sites More sharing options...
IanB Posted November 26, 2020 Share Posted November 26, 2020 (edited) I disagree that all Corydoras prefer pH from 7-8. Many corys tolerate a wide pH range (say 6-7.5/8). Many are tank raised and will be well-adapted to local tap. Others may be wild-caught from South America. The Cory species that I am aware of actually have sub-7 pH in the wild more frequently than pH above 7, coming from soft water South American rivers and streams. Of course there are many different species with many different sets of preferences. I have kept Cory’s as low as 6.4 and as high as 7.8 without any issues. Edited November 26, 2020 by IanB Fixed typo Link to comment Share on other sites More sharing options...
Daniel Posted November 26, 2020 Share Posted November 26, 2020 2 minutes ago, IanB said: Many corys tolerate a wide pH range (say 6-7.5/8). Many are rank raised and will be well-adapted to local tap. My experience with Corydoras is that they are very hardy and will tolerate a very wide range of pH. I just thumbed through my copy of Ian Fuller's 'Breeding Corydoradine Catfishes' and it looks like the typical range for breeding across about 100 species of Corydoras is between 6.5 and 7.5 pH. 1 1 Link to comment Share on other sites More sharing options...
Kirsten Posted November 26, 2020 Share Posted November 26, 2020 I'm so sorry for your loss! It looks like it was a great cory. Looks like Red Blotch Disease to me, which seems fairly common in cories. Link to comment Share on other sites More sharing options...
Ken Burke Posted November 26, 2020 Share Posted November 26, 2020 26 minutes ago, Kirsten said: I'm so sorry for your loss! It looks like it was a great cory. Looks like Red Blotch Disease to me, which seems fairly common in cories. Red Blotch disease? Never heard of it. What can you share about it? Treatment? Cause? Link to comment Share on other sites More sharing options...
Rohan Patil Posted November 26, 2020 Author Share Posted November 26, 2020 2 hours ago, MEWaters said: is this from Dean's Peru wild stock? If so, that pH shouldn't be an issue unless a major swing from ACO? any more of them in tank? doing ok? raise temp a hair? Not from master Dean's stock. Yeah there are others in the tank acting silly and digging stuff up. Being a bunch o cowards when I approach the tank. i will raise temperature a bit. Link to comment Share on other sites More sharing options...
Kirsten Posted November 26, 2020 Share Posted November 26, 2020 18 minutes ago, Ken Burke said: Red Blotch disease? Never heard of it. What can you share about it? Treatment? Cause? Don't know too much, unfortunately. It's an opportunistic infection like finrot that can occur in vulnerable fish: Red Blotch Disease In Corydoras Catfish PETCENTRAL.CHEWY.COM Pet Central explores diagnosing and treating Red blotch disease in Corydoras Catfish. Link to comment Share on other sites More sharing options...
Daniel Posted November 26, 2020 Share Posted November 26, 2020 Red blotch 'disease' may not be a disease as much as the after effects of self poisoning. The red blotches often seen in recently moved Corydoras are a well known symptom of self poisoning. It doesn't appear the author of the article linked above was aware of this phenomena. See snip below: Self poisoning is not a suspect in the sad death of @Rohan Patil's fish above however. 1 Link to comment Share on other sites More sharing options...
tr0y Posted November 27, 2020 Share Posted November 27, 2020 @Rohan PatilI've done a little research about your ph concern and it looks like most corys like it between 7-8 Link to comment Share on other sites More sharing options...
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