High nitrates - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 3 Old 01-24-2013, 01:00 PM Thread Starter
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High nitrates

`My fresh water tank is running high on the Nitrates. I have change 25% of the water already a couple of times and still the same in the Nitrates. I have Mollys and tetras. When I started about a month ago one of my tetras had ick but, I got rid of it and now, two of my mollys died and two of them are about to.,++
Whats going on??????? The mollys started to look like they had ick but then their color changed from bright orange to a real dark color. Two of my Mickey mouse mollys are fading in color also something growing on their bodys
RICHARD MARVIN is offline  
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post #2 of 3 Old 01-24-2013, 02:08 PM
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Marvin, welcome to Tropical Fish Keeping forum.

With a month-old tank containing fish, the cycle is likely a major part of this problem; even if the fish get through it, they have been weakened and stressed, which can add to issues later on. You can read about cycling here:

Second, what is the GH (general hardness) and pH of your tap water? You can find out the tap water data from the municipal water supply people, they probably have a website. This is important because different fish have different needs, and with mollies who need hard water this can weaken them seriously, adding to the problem. If you have a pH kit, what is the pH of the tank water?

Third, the nitrates. Do you have nitrates in the tap water? Always test your tap water for ammonia, nitrite and nitrate, as any of these may be present. As for the tank, what is the nitrate test result? And which test are you using?

During the 4 weeks this tank has been running, have you been carrying out weekly partial water changes, and if yes, how often and how much of the tank volume? This is critical.

The answers to the above questions will help us help you.

And the white on the mollies is most likely fungus. This is common with mollies when they are stressed, as they would be by any of the above. We can deal with this later, but we need to know the whole story.


Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #3 of 3 Old 02-08-2013, 01:19 AM
Hi Richard. I absolutely sympathize with your loss! I had a similar problem, I had started to fishless cycle my new tank with fish food until I found a fishless ammonia instruction. I switched over, but in attempt to speed up the process, I calculated a larger dose of ammonia wrong. My nitrates went through the roof and I couldn't get it down. By accident I noticed a deposit on the outfall of my HOB filters ( I added an extra one in an attempt to get the nitrates down, fruitless). I removed it and the nitrates dropped after w/c. I suspect that the excessive nitrates deposits were generated by the decaying fish food and the excessive ammonia dosing.
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