My fancytail goldfish has a big lump on his side by his fin. Does anyone know what this is or how to cure him?

More Questions. Additional questions in this category.

• 

  I have to bring 30 feeder fish to school and i was wondering if it would be ok to keep them in the bag they come in overnight?
  by Sanjam. on January 9th, 2011 | 1 person likes this

• 

  My goldfish got ich. I gave it medication (bottle brand: Kordon "Ich Attack") but it's getting even more spots! Help!!
  by Jamie_K3118 on January 18th, 2011 | 1 person likes this

• 

  Glodfish Pellets Food Expired?
  by satycorn on March 9th, 2011 | 1 person likes this

• 

  Goldfish lying at the bottom of the tank? Help please!?
  by satycorn on February 22nd, 2011 | 1 person likes this

• 

  My goldfish have recently started hanging out on the bottom. They perk up when I come near the tank, but go back down. Water test is good.
  by jhakie on February 19th, 2011 | 1 person likes this

• More Goldfish See only professionally researched Goldfish questions