Thanks, you all!
Well, I thought I linked this to salt (see below), but it turns out to be more complicated.
I lost a couple more just now, this time the young ones (about a week old). All were fine two hours ago, water is fine, now it is 17->15. They were fed two hours ago with microworms (not the first time) and Hikari First Bites. Not blaming Hikari, but not using it with cories any more... (I used Hikari on other fry before...ok for feeding livebearers, total disaster on anything else.)
These were never given artemia, so salt is not at fault here.
I'm doing a very slow 100% water change with full container disinfection...whatever is the cause, this seems to stop deaths for a while.
On salt: after some checking it seems to be a problem indeed. At the time I lost some of the older fry, tds in the tank was up to 260 (from base of 150). I did a simulation on an empty container: feed it just like I would feed the cories, make water changes the same way, repeat several times.... tds jumps noticeably and rises after a few days. This feels like the reason for losing older fry...I assume that cory fry like other should be pretty hardy at 2 week age....
This was my fault (did not rinse shrimp well enough
-- this would have not mattered in a normal tank, but water volume in the container is about 0.5g .. easy to affect ) and this problem is not to occur again.
Why the today losses I don't understand.... maybe some losses at 1 week mark are normal, maybe there is something else. I only hope the total water change will stop them like before.
Decap: This should be the preferred food indeed, I know. I use it for Panda fry, Sewellia fry (non-cory, but quite similar in many ways), other fry, and a bunch of adult fish, including the adult Habrosus. The only problem is that the first Habrosus disaster occurred the day after I gave them decap... so let me play this safe, order a fresh decap package and then offer them. (I've seen before when expired food killed some fry but not others..and my decap is a old). Next week. And if this works, as it should, decap will be offered as early as possible for future fry.
Cleaning hatcheries: probably not the case here (no problems with other fry who get the same feed)...but thank you very much for mentioning this. I did not disinfect them in months
Dddarn. This is supposed to be an easy fish.
Well, I thought I linked this to salt (see below), but it turns out to be more complicated.
I lost a couple more just now, this time the young ones (about a week old). All were fine two hours ago, water is fine, now it is 17->15. They were fed two hours ago with microworms (not the first time) and Hikari First Bites. Not blaming Hikari, but not using it with cories any more... (I used Hikari on other fry before...ok for feeding livebearers, total disaster on anything else.)
These were never given artemia, so salt is not at fault here.
I'm doing a very slow 100% water change with full container disinfection...whatever is the cause, this seems to stop deaths for a while.
On salt: after some checking it seems to be a problem indeed. At the time I lost some of the older fry, tds in the tank was up to 260 (from base of 150). I did a simulation on an empty container: feed it just like I would feed the cories, make water changes the same way, repeat several times.... tds jumps noticeably and rises after a few days. This feels like the reason for losing older fry...I assume that cory fry like other should be pretty hardy at 2 week age....
This was my fault (did not rinse shrimp well enough
-- this would have not mattered in a normal tank, but water volume in the container is about 0.5g .. easy to affect ) and this problem is not to occur again.Why the today losses I don't understand.... maybe some losses at 1 week mark are normal, maybe there is something else. I only hope the total water change will stop them like before.
Decap: This should be the preferred food indeed, I know. I use it for Panda fry, Sewellia fry (non-cory, but quite similar in many ways), other fry, and a bunch of adult fish, including the adult Habrosus. The only problem is that the first Habrosus disaster occurred the day after I gave them decap... so let me play this safe, order a fresh decap package and then offer them. (I've seen before when expired food killed some fry but not others..and my decap is a old). Next week. And if this works, as it should, decap will be offered as early as possible for future fry.
Cleaning hatcheries: probably not the case here (no problems with other fry who get the same feed)...but thank you very much for mentioning this. I did not disinfect them in months
Dddarn. This is supposed to be an easy fish.
