Fish keep dying every two days. Thought tanks was cycled.

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O.k., I will switch a filter from from Tank A to tank B, and hope that will be bring down the ammonia lrvrlsd that I purposely elevatrd in tank B in starting my fishless cycling. Thanks for all your help through this process. At what point should I start introducing fish into tank B.
 
O.k., I will switch a filter from from Tank A to tank B, and hope that will be bring down the ammonia lrvrlsd that I purposely elevatrd in tank B in starting my fishless cycling. Thanks for all your help through this process. At what point should I start introducing fish into tank B? I.E. what should my parameters be.
 
Isn't that what was suggested using the biofiltration already established with the filter from Tank A to filter the water in tank B.

Yes. And that's a variation on what Fat Homer Fat Homer suggested.

Now this part is critical so you don't repeat the same mistake. As soon as you move the filter over, the beneficial bacteria in it will need food (ammonia) within 24-48 hours. I would perform a complete water change with conditioner (prime), let it run for at least an hour or so ... enough time for the heater to warm the water to the same temperature as the other tank. Make sure there's good surface agitation. Add the fish in then ... or as soon as possible after that. Go no later than 12 hours without adding fish. If so, simply move the filter back over to the established tank with fish. (This is in case you've already moved it and don't have the fish yet).

There's no reason to think disease is causing this. This is easily explained by an incomplete cycle/insufficient colony of beneficial bacteria (on two occasions)

F fat explained what happened the first time. In so many words, you left the fiter(s) running without a food source (ammonia) for the beneficial bacteria so they were dead by the time you introduced the fish and couldn't get rid of ammonia.

Later, when you performed a fishless cycle ... that cycle was incomplete. You must wait until both ammonia and nitrite drop to absolut zero on their own. Nitrite poisoning killed the fish. Each time it was because of an incomplete cycle/insufficient beneficial bacteria.
 
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O.k., I will switch a filter from from Tank A to tank B, and hope that will be bring down the ammonia lrvrlsd that I purposely elevatrd in tank B in starting my fishless cycling.

I didn't see this before. Don't add fish with ammonia in the water!

A fishless cycle is not necessary since you have an established tank (tank A). Put the filter back on the Tank A and do a complete water change on Tank B to get rid of all that ammonia. (I'd dump the water out of the filter first, before putting it back on the original tank .. don't let the filter media dry out or the bacteria will die). Then, just do the same as above.

Setup the way you quoted, the filter will run through the ammonia and you probably won't know when runs out completely. Then, the filter bacteria will starve and die.
 
sometimes lfs will have a seeded ac filter sponge on an established tank my lfs will give you a seeded sponge if you buy a new one for their tank they always run a few types of filtration so their tank is fine get it in your tank the sooner the better. if the sponge is bigger than your filter just cut is up and throw the remainder in the tank
 
sometimes lfs will have a seeded ac filter sponge on an established tank my lfs will give you a seeded sponge if you buy a new one for their tank they always run a few types of filtration so their tank is fine get it in your tank the sooner the better. if the sponge is bigger than your filter just cut is up and throw the remainder in the tank

I had another thought. As I probably wont get the new fish for a couple of weeks, how would it work to run only the one canister filter on tank B and bring all of the other filters. two spnge filters and a canister filter, and run them on tank A for the next two weeks. And then just before I get the new fish bring the sponge filters and other canister filter back over to tank B.
 
If you arent getting the fish for a few weeks, place ALL the filters on Tank A and have them running there...

Then once you are ready to add fish, move the filter over and add fish slowly, coz the filter you move from tank A may not have enough beneficial bacteria to support a lot of fish, but one or two shouldnt be a problem...
 
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