fish dying

Hi all, I'm sorry for the bold title but I'm in a bit of an emergency with my fish. The filter of my family's tank broke and my parents decided to install a new filter, as well as replace the majority of water in the tank to clean it (yes, I know, bad idea, but they didn't know). In reaction to...

Hi my name is lydia and my baby betta marvin is sick! I've been googling and trying to figure out what is wrong with him! Here is some background. I got marvin as a baby boy betta about a month ago I got a baby girl beta at the same time and she has been doing great she's eating and growing but...

Recently in my 38gal brackish tank, I've had a couple of saddening deaths with my black mollies. Could anyone help me figure out the reason for these deaths so I can save my remaining three mollies? So far, the deaths have been identical to each other. What happens to my mollies is they'll start...