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I've uploaded a picture, but I don't know how to set it as my profile pic - any help would be great. I'd also recommend someone makes the answer a sticky! :wink:

My tank has been settled for some few months now and suddenly, out of the blue, my Penguin tetras have started to attack one another and other fish. I've had the 5, as a settled group, for about 3 months now, and two have suddenly begun attacking the others, killing one and now picking on...

90 litre tank (ish) Stock - 2 Clown loaches, 5 Penguin tetras, 6/7 neon tetras, 1 plec, 1 rainbow shark?

What can I use to bring them down? My only option at present is a water change, which i don't want to do for obvious reasons. I can't understand why my nitrite levels are so high with my ammonia levels being practically non existant. Bear in mind, I'm in the UK so I can only really have a look...

I have a possible contamination in my tank. The reason I believe the water is slightly contaminated is because I lost a 3 year old black tetra randomly and the other fish appeared to have breathing difficulties. My tank is only 2 weeks old, but we'd been given an Angel fish, 2 black tetras and...