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You don't need to add nitrate for your plants at this stage. Your plants can (and actually prefer to) use Ammonia as a nitrogen source. However this is not good for your fish. Your tank isn't cycled yet as I think you know by your test results. It is a good idea to cycle your tank before adding fish and is much more humane. Search on fishless cycling and you will see what I mean. Certainly don't add any more fish yet.

I wouldn't worry about getting your pH down. 7.6 is fine, even though the tetras might prefer it a tad lower. It is more important to have it stable than lower it.

Using more CO2 is not the best way to lower your pH anyway. If your buffers (KH) are high enough (4 is probably the minimum to aim for) then adding CO2 won't change the pH much. That is the purpose of the KH.

To lower your GH you can add rain water or deionised water or RO water.

But don't do it all at once or your fish won't like it.

Do it gradually and then at each water change.

What are the rocks?

If anything I would add more plants.

Did you change your lighting. It looks like LED.

Lindsay
 

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Hi,

Unfortunately 0.25ppm is still too high. Yes, there is too much bioload for a tank that has not cycled. All you can do is do more water changes or get rid of some of the fish, at least until it has cycled properly.

The problem is that doing the water changes will slow down the cycling. But it's better to keep the fish happy if you must have them in there. Just make sure your water going into the tank is the right GH, KH and temp of the tank water. Otherwise you create more stresses for the fish. Adjust your water in the bucket before you add it.

A safe ammonia level is 0.02ppm. 0.50 is toxic but even at lower concentrations like you have it may not kill the fish but it is bad for their health.

How long has the tank been set up?

Lindsay
 

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thanks again.... the tank has been up roughly 3 weeks now linds and maxwell i will do water changes more frequently i currently only change weekly is it ok to change daily?
Yes, it is ok to change the water daily as long as you are not making large changes to pH or GH etc. You will need to do this until it cycles.

If it has been going 3 weeks it shouldn't be too much longer. Id you have a fiend with a tank get some gravel from them and put it in your filter or just in your tank. Make sure it is a healthy tank though.

Read an article on cycling a tank or the nitrogen cycle. It is a benefit to understand this.

Lindsay
 
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