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I recently added six cardinal tetras to my aquarium. Unfortunately, within two days three of them had died along with two of my zebra danios that were already in the tank. I don't know why they died, but my water chemistry was ok, so I guess it must have been some sort of disease brought in with...

Hi I've had a 125 litre tank since 1 April 2012. I did a fish-in cycle. It took a couple of weeks before I could detect anything in the tank. Eventually I had 0.5ppm ammonia, but it never got any higher. For the last three weeks the readings have been been fairly static at NH3 = 0.25 NO2 =...

Hi I am about to set up a quarantine tank, having just lost 5 fish (2 zebra danios and 3 cardinal tetras) within a couple of days of adding the cardinal tetras (there were six to start with). I wanted to ask your advice on cycling the new tank. I have read that using gravel from an existing...

Hi there Can anyone confirm whether this information is accurate? According to my Nutrafin test kit, the toxicity of ammonia is largely dependent on the pH of the water. Apparently if the water has a relativley low pH, any ammonia will be present n the form of ionic ammonium, which is much...

Hello I’m new to this site and to fish-keeping. I listen for the collective groan as I say that I did not do a fishless cycle. In my defence I didn’t know it was possible at the time. Anyway, before you all tell me off, I'm sorry. I am here now and willing to learn. Before posting, I...