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Changing Water causes fishes to die.


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  • SRC Member

I have a 6 footer tank with a 4 footer sump.

I regularly change my water once eveyr month.

I will change the whole of my sump tank water and wash my skmmier cup

However, whenever i change my water, some of my fishes will get fin burn and ich.

Some will survive however, those new intro fishes, though they have been eating and in my tank well, will sometime not able to pull through after few days of WC.

Can any expert advise me?

1) Is it that I change too much water at once?

2) should i change to twice half sump tank amount?

3) what are the precautions to take; what are the parameter to check?

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Change water in whole sump?

Thought its suppose to do it in the display tank

Parameter also play a part

Tank Size: 42” x 18” x 12/18” (4 side and centre use Crystal Clear Glass)
Sump: 36” x 15” x 15/20”
Return Pump: Reef Octopus Diablo DC 10000
Skimmer:
Skimz SM 201
Wavemaker: 2 X VorTech MP10ES Propeller Pump
Chemical Filtration: 2 X H2 Ocean FMR75 Fluidised Reactor(Rowa & Chemi Pure Elite), Enductor Fluidized Reactor- FR30 (biopellets) with
Tesino GP-231 Amphibious Pump
Bio Media: Bacteria King - 10 Litres
Chiller: JBJ Arctica Titanium Aquarium Chiller (1/4 Hp - DBE-200)
Lighting: ATI Sunpower 6 x 39 Watt T5

(Blue+ Blue+ Purple+ Coral+ Actinic Blue+) (9hrs)

Auto TopUp system: JBJ ATO

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can you list down what you have in your sump?

e.g filter medias, skimmer, carbon etc.

likely that when you do a water change you killed off the bacteria that is needed to stabilized the tank therefore causes the problem.

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Reef Reefing Reefed

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  • SRC Member

I have a 6 footer tank with a 4 footer sump.

I regularly change my water once eveyr month.

I will change the whole of my sump tank water and wash my skmmier cup

However, whenever i change my water, some of my fishes will get fin burn and ich.

Some will survive however, those new intro fishes, though they have been eating and in my tank well, will sometime not able to pull through after few days of WC.

Can any expert advise me?

1) Is it that I change too much water at once?

2) should i change to twice half sump tank amount?

3) what are the precautions to take; what are the parameter to check?

let me guess are you using Saltwater that you brought from LFS ?

Selling big game fishing equipment. Stella 20k / 17k .. made in Japan jigging blue rose / kabuzu popping rod... pm for prices

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Honestly, if this happens, refrain from buying NSW from that LFS, because the water might not be that "cleaned".

For this case, try not to change anymore water for time being with NSW and buy salt mix (DnD / reasea e.t.c) and mix with water and add de-chlorine), 1 week change 1 pail and add bacteria.

dont add anymore fishes for time being to let those remaining fishes stabilise, hope this helps!

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  • SRC Member
Honestly, if this happens, refrain from buying NSW from that LFS, because the water might not be that "cleaned".

For this case, try not to change anymore water for time being with NSW and buy salt mix (DnD / reasea e.t.c) and mix with water and add de-chlorine), 1 week change 1 pail and add bacteria.

dont add anymore fishes for time being to let those remaining fishes stabilise, hope this helps!

Normally those fishes with me for more than 1 yr got no problem. The problems are those with my for less than a month but more than 2-3 weeks .

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Normally those fishes with me for more than 1 yr got no problem. The problems are those with my for less than a month but more than 2-3 weeks .

I guess those more then a year are used to the LFS water.Or those new fishes are still not use to the water

Change to using Salt Mix for now and try to change water a pail a week and not 6-7 pail at a go

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Selling big game fishing equipment. Stella 20k / 17k .. made in Japan jigging blue rose / kabuzu popping rod... pm for prices

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I guess those more then a year are used to the LFS water.Or those new fishes are still not use to the water

Change to using Salt Mix for now and try to change water a pail a week and not 6-7 pail at a go

Do I have to use DI water?

U state anti chlorine...u mean use normal tap water with anti chlorine n mix with salt.

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yes, you can fill up a pail of tap water, add in salt, add in anti chlorine, if you dont know how much salt to add, add bit by bit and measure 1 hour interval (to let salt dissolve) but best is to mix the salt already leave 2-3 days full dissolved and chlorine to disapper then change the water.

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you can use either one...

DI resin have the impurities removes from the water... Which means the water is much cleanner then tap water... You can read up more regarding DI or RO water...

Selling big game fishing equipment. Stella 20k / 17k .. made in Japan jigging blue rose / kabuzu popping rod... pm for prices

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from my experience.. the older the tank is the lesser amount of water change needed. as water parameters are more stable and we are actually doing water change to replace missing trace elements that we do not test for.

roughly 5% of the tank vol.

we are talking about the similar amount of livestock and filtre system etc.

every water change kills bacteria. therefore if you change 100% of your sump the bacteria will die off.

try reducing the amount of water change. esp from your sump. perhaps 50% of it or lesser. monitor the livestocks and like bros advise. best not to increase livestock and let them be stable first.

considering if your sump is a 4x1.5x1.5ft is alot of water involved.

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Reef Reefing Reefed

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Fin burn usually due to ammonia. If you have not been adding buffer you could have low pH issues, ammonia is not so harmful at low pH as as it shifts towards ammonium. Once change water pH goes up and the ammonia becomes more harmful, causing your fin burn & ich issues. Best to get a pH meter to confirm.

Always something more important than fish.

http://reefbuilders.com/2012/03/08/sps-pico-reef/

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I encountered a few times when I change water in the pico tank, I found that there is a spike in nitrite after water change, the fishes suddenly breathing very fast after 40% water change. Check on your nitrite level after water change to see whether there is a spike. it is one of the reasons. For nitrite, there is no quick solution in the market to solve.

For ammonia, check your ammonia level after water change, if it is high, I sugguest use Kent marine Pro-Ammonia Detox. It can help to reduce the ammonia very quickly.

 

 

 

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