Cycling

What about temp? Dumb question I know. But I heard that if you cycle a tank in cold water ( because there's no fish), then add fish and heat, the cycle can change.
Maybe someone can verify that?

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there's a few ways a new filter in addition to your already established filter could cause an ammonia spike.

there was something on it that caused your established bacteria to die. did you clean off the new filters and media before adding?
they could have sucked up food and now that food is rotting and you don't have enough bacteria to cover it.

it's also possible you just got a pocket of ammonia. try testing again in another section of the tank.

Did you conduct a water change and filter cleaning within a week of each other. Are you using a sand substrate.

I've been warned that adding a new filter to a tank can create a mini cycle. you said you added two!!! If you are concerned conduct a 40% water change every other day for over the next 5 days and don't feed your fish for the 5 days. It give the bacteria time to build up again without creating more waste from feeding.

Also NEVER deep vaccum a sand substrate it will destroy your bacteria. I forgot this rule and deep vaccumed my sand and had to employ the 5 day process I mentioned earlier. ONLY skim the vaccum allong the surface of the sand.

Try the 40% water change every other day for the next five days and dont vacuum the sand or feed the fish. This will quickly remove the ammonia that can be harmful to your fish, and decrease the bio load while the bacteria has a chance to develop. I did this when my test vial was a solid green and 5 days later it was a light yellow (.0 ppm). I changed the feeding to every other day and a 25% water change every 2 weeks. Its been a month with no spikes.

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rkscwh said:

Also NEVER deep vaccum a sand substrate it will destroy your bacteria. I forgot this rule and deep vaccumed my sand and had to employ the 5 day process I mentioned earlier. ONLY skim the vaccum allong the surface of the sand.

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sorry to tell you, but this is not true.