Hi! Joined to get help - lump on tail

[amzhydro]

I have two beautiful goldfish, Sushi and Mr. Orange, just comets I got a Petsmart. I've had them for a while now and they're huge. They're in a 10 gallon tank that has had some trouble with algae. They have a 20-30 gallon Aqueon filter and I do gravel vaccum half-water changes once or twice a month. There's a Amazon Sword plant in there that they snack on, and one mystery snail.

Mr. Orange has a bump on his tail. He looks healthy other than that, is eating, swimming fine, no weirdness or other symptoms. Sushi (the white and orange one) has no symptoms. Anyone know what this is, or if it's dangerous?

 

[Tifftastic]

Welcome to AC!

It doesn't look like anything of concern to me. However, I am concerned with the size of your tank and your cleaning schedule for such large fish. Have you ever checked the nitrates? A tank that size with two goldfish really should be getting a 50-75% once a week rather than once or twice a month. While this may not be a problem now, it will likely be in the future.

 

[amzhydro]

Welcome to AC!

It doesn't look like anything of concern to me. However, I am concerned with the size of your tank and your cleaning schedule for such large fish. Have you ever checked the nitrates? A tank that size with two goldfish really should be getting a 50-75% once a week rather than once or twice a month. While this may not be a problem now, it will likely be in the future.

They grow so fast!! I actually just got them this tank probably 6 months ago and they already need a new one. I'm moving soon though so I can't get them a bigger one for a bit. Yeah I've checked the nitrates, they can run a bit higher than they should at times but overall things are where they should be. I'll definitely increase the water change frequency. Thanks for your advice.

 

[SantaMonicaHelp]

Fish look very sweet
How do they feel now? Did you find the answer to your question?

Zhenya