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My pacu of 1,5 years was strongly beaten by Labio. Pacu is still alive and I want to do something to save him (unlike Labio whose fait has now been sealed) any advice on what to do?

I got myself for the second time a Chitala ornata / Clown featherback, and with 24 hours it died, both times! First time a got a smaller one, around 5", and 2nd time around 15". Both times died during the day, not the first night. No damage on their bodies was found, so I rule out that it was...

I've got a problem. I've had a perfect 450l aquarium for about 5 months with a great nitrogen cycle, all was perfect! Now last few days, all NH4, NO2, NO3 are way too high! I've cleaned all my filter (got 3) and changing water for 3rd day in the row and nothing helps, within 24 hour all are back...

I have 2 JBL 1500 filters pumping 1500litres per hour each. They are rather new, about 2 months old, and recently I noticed they they aren't pumping as much as they used to, at least 2 times less. The filter is clean and I don't know what to do. Any advice would be appreciated! Sent from my...

The upper lip of my Pacu looks very strange, I think it's some kind of a disease. But I don't know what it is and hence don't know how best to treat him. Any advice would be appreciated! Sent from my iPhone using Aquarium Advice

I have a big pacu in my 450litre aquarium. He is with me for 2 months more, eats very well, but he's not black, but silver. He was black in the aquarium from there I bought him. Can someone help what to do? Sent from my iPhone using Aquarium Advice

I have a 450litre aquarium with some smaller fish and a huge pacu. He looks great, eats well, but always stays in one corner of the aquarium. Why? Is there anything wrong with it? Sent from my iPhone using Aquarium Advice

My big Challenger fish has a big red spot next to her mouth. Can you advice what is it and how to treat it? Sent from my iPhone using Aquarium Advice

About a week ago I got a big Pacu to my 100g tank. He's there with a bunch of other big and small fish. All eat well, but my Pacu hasn't eaten for a week. Can u please help what to do?? Sent from my iPhone using Aquarium Advice

Hi! 1 week ago I got two small Oscar fish, and now I noticed they have small white spots all over and especially on their fins. Could this be fungus? How best to treat them? They are in a 100g tank with a bunch of other bigger fish, which don't have these spots. Sent from my iPhone using...

Hi everybody! Just joined AA, and exited to be a part of such an awesome community. I'm new to the hobby, started with a 5g tank just 3 months ago, and 1 month ago go a 2nd tank of 90g. I have some piranha and some Oscar and a few catfish. So far so good... Can't wait to get a 3rd tank for...

About a week ago I got a new fish, a big 40cm black piranha pacu into my 450 litre aquarium. It doesn't want to eat anything and turned into light silver colour and always stay on the bottom. Doesn't move much, but sometimes makes very motions and bumps into aquarium walls very hard. Any idea...