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Ammonia before Adding Fish


preswash
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I set up a new 29 ...scrubbed it with Dawn and thoroughly rinsed it. Filled it with tap water filtered through 2 carbon pre-filters. Put on an established penguin 330 hang on back with high quaulity bio media (no cartridges). Also put in a bubble up filter with sponge and micron pad.  Been running 10 days with no fish, plants, or anything. Water, bubble up filter and the penguin intake are the only things in the tank. Now for the last 3 days I'm getting an ammonia test showing between 1 and 2 ppm. All my other tanks read less than .5 ppm. 

Why am I getting ammonia in that tank?

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Was any of the equipment in the tank previously in other tanks and then allowed to completely dry out? If so there could be enough bio-matter (algae, biofilm etc) that died off in/on them that is decomposing to cause the ammonia to be generated.

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