Cpo random deaths

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A

A_K_Kicker

Feeder Fish
MFK Member
Jan 25, 2013
73
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KC, MO
Just recently my cpo's have been dying and I was wondering if flourish iron is killing them? My water is good according to crappy test kit (probably take a sample to my lfs). Is there a common reason why they randomly die?

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No, they are pretty sturdy. I would stop the iron (or look closer at the chemical ingredients) and see fi it stops. Many bottled ferts contain copper, which over time can cause issues.

Have you tested your water lately for ammonia, nitrite, and nitrate? How old are the crays?
 
I tested my water and it didn't pick up on any nitrate or ammonia. I haven't dosed with iodine because they had molted before and the shell looked like it came off in one piece. The flourish said it contained .0001% copper. Could dosing twice a week be the reason they died? (They crays were only like 3/4" long so idk how old they were)

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I don't dose iodine either, most of what they need is found in tap water or in foods (at least with dwarf crays). .75" is subadult, generally 4-5 months old. they should live quite a bit longer than that. That amount of copper *shouldn't* cause an issue. Are you also dosing other ferts? Any dried ferts? What is your source water like and what temperature is the tank
 
The only other "ferts" I have is dirt capped with sand. My water is 80*. I only had two and they died within a week of each other. They started laying on there backs, kick around and die. Each time I have had 0 nitrate and nitrites.

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Have you ever used any heavy duty meds in the tank (for parasites or perhaps a copper based med for external illness)
 
I have never had any to dose for parasites before. Ill go to the lfs and have them check my water. Maybe my test kit is not catching something?

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Sounds that way, as dwarf crays (and shrimp) are very sensitive to ammonia and nitrite, and nitrate levels over about 20ppm
 
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