hello i posted how half all of my 22 fish died when i did 50% water change i did everything i should of done and everything died and i am not sure on what happen i am thinking mabye there could of been something in the bucket i may have used anyways i have a four foot fisn tank that is around about 220 litters or a 55 gallon fish tank i have two power filters on each size which each do around a 200 littre tank it could easy do a 300 litter tank and two 200watts heater on each side of the fish tank i need you guys to help me becuase sometimes i rush into things and i think i know it all i dont not know it all i wanna get it right this time i cant afford to buy a light so i am useing a lamp and faceing it down into the fish tank sitting on top of the tank it brights up the tank so i can see the fish beeter. sence my fish tank as crashed i only had 2 fish that made it thorw and never died this tank as been runnig sence january with the same filters so it has cycled however i got my water test around 3 weeks ago the time i had the fish tank crash was around 6 weeks ago when i went and got the water tested it had 025 ammonia nitrite the same and nitrate ithink was something about had hardly anything in it that was almost 4 weeks ago when i got this tested i have sence done nothing with the tank just left it on runnig with 2 fish in there with no probelms i wanna make my fish tank look nice so what things should i add and i am thinknig about getting some fish in there soon. so should i test the water again should i empty all the water out just incase there in something bad still in there from last did i did that 50% water change when my fish tank crashed i have sence then changed 25% thats all i have done sence it happen i wanna make my tank look good with rocks and all that stuff to make it look really good if u can help me i will be really happy thank you
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- Thread starter David12
- Start date
You are in a very bad situation David. You do not have any information about your tank or its chemistry. From that I must assume that you do not have a reliable test kit to give us that information. The simple two water changes in such a long time means to me that you have allowed your water quality to become significantly degraded. I'm sorry if that seems a bit harsh but it is how I see things. Your best course of action now is to start doing regular water changes of perhaps 30% each week. After a few weeks, you could try adding a few fish, but not very many, at a two week interval. Once you have built your fish population to near typical stocking levels, not the ridiculous levels you see at the LFS, you can stop to consider where you have gotten with our fish.
You have said that you did everything you should do with a water change but please check this against your water change standards. All water changes require that you use a dechlorinator to ensure that all new water is free of chlorine. All new water changes must be temperature matched to the existing water in the tank. That means that you at least check the water temperature with your hand and find a decent match. Any water change is done with adequately oxygenated water. If you have a well system, you use a storage tank that lets the water absorb oxygen, if you have a typical water supplier, this is not a problem. You never let your tank water deteriorate significantly between water changes so the change in mineral content from a water change is not too great.
If you have water samples that show any ammonia or nitrites, you must do a water change to remove those chemicals. The samples you cite are samples that indicate that you had a need for a large water change way back when those samples were done. By now you are probably not facing the same levels of contaminants, but your prior readings do tell us why you lost most of your fish. Now you are facing the simple fact that regular water changes are needed on any tank. As long as you take that to heart, you will have better results when you look at your chemistry. There is really no reason to lose any fish to chemistry problems ever.
You have said that you did everything you should do with a water change but please check this against your water change standards. All water changes require that you use a dechlorinator to ensure that all new water is free of chlorine. All new water changes must be temperature matched to the existing water in the tank. That means that you at least check the water temperature with your hand and find a decent match. Any water change is done with adequately oxygenated water. If you have a well system, you use a storage tank that lets the water absorb oxygen, if you have a typical water supplier, this is not a problem. You never let your tank water deteriorate significantly between water changes so the change in mineral content from a water change is not too great.
If you have water samples that show any ammonia or nitrites, you must do a water change to remove those chemicals. The samples you cite are samples that indicate that you had a need for a large water change way back when those samples were done. By now you are probably not facing the same levels of contaminants, but your prior readings do tell us why you lost most of your fish. Now you are facing the simple fact that regular water changes are needed on any tank. As long as you take that to heart, you will have better results when you look at your chemistry. There is really no reason to lose any fish to chemistry problems ever.
BethK
Rattie tat tat
ohhh, you really should water change once a week, not every 3 or 4 weeks, oldman has given some good advice 
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