Too much fertilizer - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 07-01-2014, 03:04 PM Thread Starter
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Too much fertilizer

Can adding double the fertilizer kill fish and shrimp?

I didn't add any fertilizer to the tank for a week and did a 50% water change 2 days ago. I added double KNO3 and Trace Elements.

3 baby Guppies, 1 Threadfin and 1 Amano Shrimp have died. Both Kulli Loaches are swimming around like crazy. All the other fish, shrimp and snails appear to be fine.

I'm doing a 50% water change right now.
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post #2 of 8 (permalink) Old 07-01-2014, 03:11 PM
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The Potassium nitrate probably killed them.

Ferts are like medications for humans... If you miss a dose don't double up next time, just continue on as normal.

Water change should help...

Sorry to hear about the fish
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post #3 of 8 (permalink) Old 07-01-2014, 03:13 PM Thread Starter
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Ok, that's what I was afraid of. Thank you.
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post #4 of 8 (permalink) Old 07-01-2014, 05:11 PM
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What size tank, and how much? I don't believe a 2x dose of CSM+b or KNO3 would be that dangerous to your fish at the point of killing them. I would suspect something else going on.

Last edited by Ruxl; 07-01-2014 at 05:12 PM. Reason: can't type...
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post #5 of 8 (permalink) Old 07-01-2014, 05:22 PM Thread Starter
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75 gallon, heavily planted. Instead of 1/4 tsp. of each, I added 1/2 tsp. of each.

Nothing was done differently except that. Since I've done a 50% water change today, they have calmed down.
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post #6 of 8 (permalink) Old 07-01-2014, 06:33 PM
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Quote:
Originally Posted by Ruxl View Post
What size tank, and how much? I don't believe a 2x dose of CSM+b or KNO3 would be that dangerous to your fish at the point of killing them. I would suspect something else going on.
+1

Your double dose of KNO3 (1/2 tsp.) is not even a full EI dose for a 75 gallon. Subtracting 10 gallons for displacement, 1/2 tsp. will only raise NO3 in 65 gallons 6.5 ppm. Every other fertilizer used won't kill fish off with a double dose. Make sure you're using teaspoons and not tablespoons. Believe it or not it's a common mistake.

If you have any test kits I would test your water.
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post #7 of 8 (permalink) Old 07-01-2014, 06:49 PM
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When you did the original water change did you forget to treat the water perchance?

CSM+B would be a heavier risk to causes issues with your fish but even then a 1/2tsp dose shouldn't come near to causing an issue.
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post #8 of 8 (permalink) Old 07-01-2014, 07:39 PM Thread Starter
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I have well water so there's no need to treat. I don't know what else it could be. I do the same water change, the same way every week.

I'm very experienced with keeping water. I have had show koi for 25 years. All tests are good with the exception of 0 NitRates, which in koi ponds is perfect. I don't have a test kit for phosphates.
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