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amonia, nitrite & nitrate

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Kel,

Very simply, ammonia is created when your fish expel their waste into the water. Ammonia is toxic to fish in high concentrations. The aerobic bacteria in your bilogical filter feed on the ammonia and turn it into nitrites and then nitrates, which are both still toxic in high concentrations, but less toxic than ammonia. Nitrates are also less toxic than nitrites. Unless you have a specialised biological filter containing anaerobic or anoxic bacteria, which feed on nitrates, the only way to reduce nitrate levels is to do a water change.

So :

1. Make sure you have effective biological filtration (please tell me you don't clean your filter using tap water, as the chlorine in tap water kills off all your aerobic bacteria. Best to clean your filter in a bucket of water from your tank).

2. Do regular water changes on your tank, usually say 25% fortnightly.

Cheers, Doug

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Doug is spot on here. My concern is where you say most of your tanks. 8O

Things are not going as they should be, things to look at.....

How long have your tanks been up & running for?

How often & how much do you feed your fish?

What are the stocking levels in your tanks?

How do you clean your filters?

Do you use gravel?

How often & how much do you do water changes?

Do you use a gravel vac?

For now, you are going to have to do water changes. 30-50% now. & if it was me I would be doing another big one tomorrow too.

Cut back feeding to one small feed, every 2nd day. For probably 2 weeks.

If your filter{bacterial producing} levels are low, & you don't or can't run more filters. Look at adding something like lava rock in the tanks. This is porous, therefore good for bacterial growth.

Frenchy :D

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wow guys information overload, but all very helpful. ok here goes:

* i do try and do regular water changes just did one last week.

* i did once clean the filters in tap water but a little while ago. in my canister i tipped out old water and put new stuff in but that was over 3 to 4 weeks ago. hardly even clean them now anyway ( is that bad )

*have a variety of gravels, use sand and rocks from landscape place, in another have small black rocks from pet shop and white ones in other and have this other white carb stuff in the other, not real sure of the name of the last stuff meant to be good though.

* have got a gravel vac and only cleaned the gravel maybe once since we have started.

* 3 of the tanks are about 3 weeks old with filters that had been in other tanks. my other 3 tanks have been running for about 3 to 4 months now.

* feed my fish twice a day probally the size of a 5c peice.

* and what is stocking levels.

cheers kel

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in my canister i tipped out old water and put new stuff in but that was over 3 to 4 weeks ago.

That could be the problem for one tank.

3 of the tanks are about 3 weeks old with filters that had been in other tanks.

That will be the problem with those tanks then, they are cycling.

my other 3 tanks have been running for about 3 to 4 months now.

It is possible that these tanks have never cycled properly. Still relatively new.

and what is stocking levels.

How many fish to tank space? Are the tanks overloaded with fish?

i do try and do regular water changes just did one last week.
Yeh but, how much & how often?

Prime usage just for the new water that you add.

I hardly ever clean out my canisters. I go by when the flow starts to slow down. Bio media just needs to be dipped in tank water to rid excess rubbish.

Frenchy :D

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