Please help

[CarmandShan]

Good morning. I will try to make this quick. We had to buy a new tank because the one we had started to leak. We had angel fish for quite some time and wound up with just one. We upgraded to a 36 gallon from a 30 gallon. Our one angel fish went to fishy heaven so we decided to get something different with the new tank. We got 2 molly's and 1 platty with the help of our pet store attendant. As of now, this is our 4th batch because they haven't lasted one day in our new tank. We let it filter with no fish for about 4 weeks now and had the water tested several times. Went back yesterday for 3 new ones and woke up to 1 alive. Why do they keep dying?? Please help!!

[charliebankston]

Have you or the store tested your water. Running the filter on a clean empty tank did nothing. Here is some help on cycling your new tank
https://aquariumscience.org/index.ph...cycling-index/
https://fishlab.com/how-to-cycle-aquarium/

[charliebankston]

Nm, I see where it was tested. Do you know what the numbers were?

[CarmandShan]

There were numbers just test strip with colors. Only the alkalinity was low

[charliebankston]

Might be your ammonia or nitrites are too high. That will kill fish if the tank isn't cycled properly

[CarmandShan]

Just came back from the store and FINALLY was suggested that we needed a bubbler. Did not realize that the fish was lacking oxygen. Got 3 giant danio's and doing great.

[charliebankston]

Awesome!

[CarmandShan]

So the 3 giant danio's we got yesterday are now belly up. Even AFTER the bubbler went in. I just don't understand. Is there anything else we are NOT doing or NEED to do??

[fishwonder]

Originally Posted by CarmandShan

So the 3 giant danio's we got yesterday are now belly up. Even AFTER the bubbler went in. I just don't understand. Is there anything else we are NOT doing or NEED to do??

What are your exact water parameter numbers? Ammonia, nitrite, nitrate and pH? What water conditioner are you using to remove chlorine whenever you add or change water?

[CarmandShan]

Just tested the water and everything was normal. Aqueon water conditioner is what we use.