What is this smell?

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John Williams

Feeder Fish
MFK Member
Aug 10, 2017
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Ok here is what happened. I have a 150 gallon aquarium with frontosa I fed them some shrimp as I do from time to time I saw that all the pieces I fed were eaten so I went to bed. Woke up the next morning and saw a piece of shrimp floating around (I assume one of the frontosa spit it out) removed the shrimp tested the water and my nitrites were 15 ppm I thought it had to be a false reading so I used my back up api master kit and got same reading so of course I went into full panic mode did 75% water change 4 times back to back rechecked it and everything is good except my nitrates are 0 and there is a smell that to me smells like garlic or sulpherish and the water has a slight brownish tint to it when looking from the side now which it did not have before. I habe no wood in tge aquarium so tanins are out. Any recommendation or tips on what I should do. I run 3 fluval fx6 and an ehiem 2262 fluval marine reef led light and a beamworks led light. Jim silicate pool filter sand substrate and feed northern and nls pellets. Hope you have all the info you need to help. Thanks
 
Are you on a well? Did the well become "stirred" up from the large water usage? It could just be a vien of sulphur. This could also affect your water color.

I ran my well pretty gard one day and stirred it up a bit. (Large water changes, shows, washing machine, watering garden. What was i thinking?) and i had some weirdness.

If you are not on a well, then i am out.....

In a side note, what media are you running? I would suggest loading one filter with ceramic media or the like. This should help if something similar happens in the future. Your levels ahould not be off from an experience like that with your water volume and three fx6 filters.

Also test your parameters in your water source.
 
Are you on a well? Did the well become "stirred" up from the large water usage? It could just be a vien of sulphur. This could also affect your water color.

I ran my well pretty gard one day and stirred it up a bit. (Large water changes, shows, washing machine, watering garden. What was i thinking?) and i had some weirdness.

If you are not on a well, then i am out.....

In a side note, what media are you running? I would suggest loading one filter with ceramic media or the like. This should help if something similar happens in the future. Your levels ahould not be off from an experience like that with your water volume and three fx6 filters.

Also test your parameters in your water source.

Each my filters are set up different one is mechanical one is biological the other is mechanical/chemical and the ehiem is loaded with ceramic rings. I am not on well water.
I use sponges matrix purigen and tons or ceramic rings and do regular maintenance on my tank and filters. All my fish are fine and look happy/healthy. I figured with nitrites that high they would have died almost instantly.
 
Are you on a well? Did the well become "stirred" up from the large water usage? It could just be a vien of sulphur. This could also affect your water color.

I ran my well pretty gard one day and stirred it up a bit. (Large water changes, shows, washing machine, watering garden. What was i thinking?) and i had some weirdness.

If you are not on a well, then i am out.....

In a side note, what media are you running? I would suggest loading one filter with ceramic media or the like. This should help if something similar happens in the future. Your levels ahould not be off from an experience like that with your water volume and three fx6 filters.

Also test your parameters in your water source.

The nitrite spike was caused by the left over frozen shrimp I'm pretty sure. The smell was there the next morning when I found the shrimp. Water at the tap tests great
 
Ok. Just offering ideas.

It seems that an fx6 full of ceramic media could/should handle that much dead shrimp for an overnight. I would still investigate the filters. Something is going on.

I thought your smell was after the water change. My misreading.
 
that is strange, no ammonia, and no nitrate? but nitrite? not make allot of sense to me.
 
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A minni cycle per say would show ammonia, nitrite and nitrate. even overloading the system with protean would show nitrate.
 
A minni cycle per say would show ammonia, nitrite and nitrate. even overloading the system with protean would show nitrate.

Ammonia is 0 and nitrate is coming back not too sure what could have happened but all parameters are good now but still smells.like garlic lol
 
Hello; Do you have sand as a substrate and if so is it over an inch deep? Fine sands pack tight and can form pockets of gasses. Could the substrate have been disturbed?
 
Hello; Do you have sand as a substrate and if so is it over an inch deep? Fine sands pack tight and can form pockets of gasses. Could the substrate have been disturbed?

I have non silicate pool filter sand about 2-3 inches it is possible it got disturbed but didn't see where anyone was digging but the sand could have burped but don't know why the smell is strong haha. The smellnis still there. Smells like olive garden
 
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