Hi all, this is my first post on this site, so I will try to include as much info as I can. I have a 5 gallon tank with 5 male guppies in it and one of my guppies isn't doing so well. He has a bump growing on his stomach and I'm beginning to think the worst. I don't have a kit to test my water...

I started my first aquarium (freshwater, 55-gal) in January of this year. At that time I had six zebra danios. After a couple of months I saw that this one was getting picked on by two others. They would chase her/him as they do in the morning but it got to the point that this one got skinnier...

My poor Sachi... He's swollen to the size of a marble. :-( I spent hours trying to figure out what he has so I could help find a treatment. After visiting several aquarium stores and browsing the internet for hours I finally found out what's wrong: he's got an internal tumor. He fits the...