diagnose

Can anyone tell me what this is? Only the nerite has it nothing else in the tank has it.

For my very first aquarium I decided to start with guppies, I got a beautiful blue female who I named Azura, and she was always so strong and active. She has had about 4 or 5 pregnancies so far, but lately she started acting oddly, losing a lot of weight and being less active, usually staying at...

Hello. We've had 3 cories for a while in a very healthy, planted, and well-cycled tank. One started to develop a growth on its gill, and it does not look fungal (i.e. no fuzzy texture). This was about 2 weeks ago. Since then, we have quarantined it and have treated the water with the following...

My half moon Betta, Crescent, has had some chronic fin rot on and off for the better part of a year. This is very long, but I am desperate. Please help! While at first I made some beginners mistakes with an unfiltered and too small tank, he’s been in a cycled 5 gallon for all but maybe a month...

Hi, I’ve attached a youtube video of my Danio which I have had for maybe 3 months now. The last few weeks its been looking really chubby and has an extra kind of hump under its chin. Now it seems to be breathing quickly and keeping away from the others. Is it pregnant and going to lay eggs...

I have a 37 gallon aquarium with a school of 7 Diamond Tetras, looking to add maybe 5 more. Other fish include 5 Cardinal Tetras and 2 Clown Plecos. I have 2 Diamond Tetras with their mouth stuck open and their nose is stunted (see image). All are peaceful and get along really well. I can't...

Would anyone be able to help diagnose this glow light tetra? (I’m very new to this). Thanks so much in advance!

My bristlenose pleco has a pale patch on head. I'm concerned it's a sore or beginning of infection. Can anyone advise?