Should I still be getting ammonia in the tank?

eohippus

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Feb 8, 2008
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This board has been an invaluable resource for us in our new hobby of fishkeeping. Thanks for all your help in answering questions, and for all the great articles. I'm still concerned however, about the ammonia readings we're getting in the tank and I'm wondering if it's normal.

We got my 13-year-old a 14 gallon tank in October and placed 6 zebra danios in the tank. Currently, there are 5 danios and one otocinclus. He uses the API liquid test kit and tests the water twice a week. Usually the readings are 0-0-10 (ammonia, nitrite, nitrate). Sometimes, however, he gets ammonia of 25. When he does, he usually scoops out and replaces about 10% of the water, maybe a little more.

We do 25% water changes every 7 days like clockwork. When replacing the water, we use about 8 drops of SeaChem Prime, which we drop into the tank (including a few onto the sponge filter, which is in a separate compartment which needs to have water added to it) before adding fresh water. (I now use an instant-read thermometer to be sure I'm putting water back in at the right temp). My son rinses the sponge filter and changes the charcoal/media filter on an alternating schedule every two weeks (i.e., rinse the sponge filter, wait two weeks, change the filter media, wait two weeks, etc.). He rinses the sponge filter in fish-tank water. (OK, he made the mistake of rinsing it in the actual tank once, but we're past that now.) Other than that, he feeds TetraMin crisps -- just a few, twice a day.

Why are we still seeing ammonia? Sometimes he'll test the water two days after a water change and that's when the ammonia will show up. Other times, the water is fine until right before our scheduled water change. Is the tank not cycled yet? Or is this normal?
 
First, how old is this tank?

Second, shouldn't feed twice a day, once or every other day is fine.

Third, It is possible your water has chlorimines, (ammonia bonded to chlorine) in which case, don't worry. Prime changes the ammonia to NH4 (instead of the highly toxic NH3). API ammonia test kits will detect NH4 as well as NH3.

Fourth, you shouldn't ever have to replace the filter media unless it is completely worn out (I.E. falling apart.)
 
it is possible to see a small ammonia spike after a water change. many of the conditioners make chaloramines safe..when it does this it breaks the chorine ammonia bond and converts ammonia to ammonium.

the test kits we use test total ammonia so you may see the ammonium.

if the tank is cycled no big deal...the bacteria will consume the ammonia/ammonium

btw..how much you feed your frish depend on the fish and how you feed them. I feed mine small amounts so they get daily feedings with Discus and Angels getting 2 small feedings daily.
 
The tank was brand new when we bought it. It is one of those BioCubes. I thought I was supposed to change the filter every month. It does get filthy looking.

So you are saying that it is possible that the ammonia we're seeing might not be dangerous? How would I know? We had a bunch of fish die between the time we thought the tank was cycled (about 8 weeks after getting the danios) and now, when we think we're finally getting the hang of doing it "right." We don't want to get anymore fish if it means putting them in danger again. The current fish have been with us from the beginning (the oto was not added until several months ago) and we don't want to lose these either.
 
I rarely change filter media.
many times you can get by with simply rinsing the filter media out in pld tank water.
a .25 ammonia needs to be monitored. I would suggest yuou test the water after a few hours and see if the ammonia drops.
 
Yes, everything gets rinsed after use, then air-dried. Why wouldn't the tank be cycled by now, nearly 6 months after setting it up?
 
I would stop changing the filter and rinse it in old tan water instead. Like you said that's not the same as in the tank. Don't worry about what the filter company says too much, their objective is to get you to buy more filter elements from them. Any carbon that might start out in your filter is no longer effective after a couple of weeks so don't worry about that aspect. When the filter cartridge will no longer hold together its time to start thinking about replacing it. Until them its rinse and re-use. This should stop the mini-cycle that you have been experiencing.
 
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