sudden death

Hi all I refer back to this post I made a couple of days ago for background: https://www.fishforums.net/threads/ammonia-spike-after-fertilising.494145/page-2#post-4337085 I did about a 65/70% water change a few hours using remineralised RO water, I just went back to feed the tank and my fish...

First off - I apologize as this will probably be a novel. Can anyone help me ID what killed my albino corydora? I've had two for over a year (which I know they need more friends, but I didn't have tank space until very recently and haven't even had a chance to increase their school size), and...

So a balloon molly of mine (fairly new) began looking extremely round a few days ago. This happened to another molly of mine, who we thought was pregnant but ended up just developing her shape. This molly, however, became larger than any other molly in the tank. Yesterday I noticed she wasn’t...

Hey guys, I've been in the hobby off and on for over a decade. I don't have any home tanks, but I have a 40 gallon planted tank in the office which I hadn't been properly maintaining for awhile due to health issues in my family. It had a low level of stocking (a mixed school of boraras, a...

Hey! So I got this guppy for my brother about 3 months ago now and I just found him nose up in a plant dead very sad brother, I got him with 1 other guppy who is fine but when I got him he was acting strange straight away, when I got him he was black then he turned white and this carried on I...

However none of the deaths seem to be the same, Tank Overview: Running for 1 year 5 months 80L Tank (though bought thinking it was 100L, advertised secondhand incorrectly) possibly over crowding Fluval 306 external Filter Fish in the tank leading up to this post: 1 Pleco 4 Cardinal Tetras 4...

Hello, I purchased a Betta in February. Shortly after I got 2 Albino Cory Catfish to live with my Betta. Things went well so I got a third Cory in the beginning of March. I have a 3.5 gallon tank and I have some moss balls in it. I brought the water in to Petsmart and they tested it for me...

Hello, I need help! This has happened to me several times - I change my betta's water and he is dead the next day.  I am mystified.  I have a betta in a 2 gallon container and change his water every week.  I have done this for 2 years and he has lived there happy and healthy, quite large and...

250l tank 2 x externals Set up 3 years Weekly 40% water changes All water tested normal, as good as it could be with our tap water Temp is normally 25 ish but was 27 yest when problem started Did have 4 red line torpedoes 4 blue rainbow 3 banded rainbow 2 boesmani rainbow I clown pleco 3 cory...

Hello there. 2 weeks ago I was left with my mother's/sister's fish after they moved out of my home. From what I can tell, the fish is a black moor fish. My reason for posting is that, I have just now discovered the fish dead in its tank, despite there being no signs of anything out of the...