Here at The Goldfish Tank, we get a lot of questions from goldfish keepers.
We love receiving your questions and will always do our best to answer!
To help everyone who visits The Goldfish Tank – rather than just one person at a time! – we’ve decided to gather all of the questions and answers here; in The Big Goldfish FAQ!
I think my goldfish has tumours but not sure what to do. Could you help?
Unfortunately, tumours can be quite common in goldfish. If the tumours aren’t bleeding or causing the fish obvious discomfort then most people simply ignore them. It is possible to surgically remove tumours. However, it’s a complex and expensive procedure, which means that few people choose this option for their fish.
My goldfish has the symptoms of mild finrot, when I attempt to treat his tank with Interpret Anti-fungus and Finrot it severely damages the good bacteria in the filter and surrounding tank and his water goes off, and i have to abandon the course to do water changes. can you advise me please?
You say that the fin rot is mild, so you may be able to treat it without using chemical medication. Get your water parameters back to healthy levels and monitor your goldfish’s behaviour closely. Are they scratching against objects or the sides of the tank or displaying any other signs of discomfort? If not, they may heal naturally over time once their water is in good condition.
If the fish shows signs of discomfort or the fin rot doesn’t heal then consider adding a teaspoon of aquarium salt per gallon of tank water.
Finally, consider what caused the problem in the first place? Fin rot is most often the result of poor water quality, so be sure to use a test kit and keep a close eye on your water parameters.
You can read more about fin rot here.
Years ago I kept Freshwater Tropicals and had thirty tanks on the go. I gave it all up when I started doing a lot of travelling, and had nothing for many years. After I retired, and my partner passed away, I had time on my hands and decided to buy a SMALL tank and got some “Feeder Goldfish”. Some of them died quite soon, but two of them survived and I decided to buy a few more to keep them company.
They quickly outgrew my small tank so I bought a larger one. My surviving “Feeders” kept on growing, so now I have a medium sized tank with six — six to eight inch beautifull Goldfish rubbing shoulders with each other.
I have no space in which to place a larger tank, and these fish just keep on growing. I don’t know anyone who has a larger tank or a pond, so if they get much larger, I think I’ll just have to have FISH on the menu. I know that I have grown my own problem, but what do I do?
Well, hopefully you’re joking about having fish on the menu! 😉 But you’re absolutely right that your tank is overstocked and that this will be a big problem for your fish as they grow.
You say that you don’t know anyone with a larger tank or pond, but is there any other way to find some of your fish a healthier new home? Perhaps you could advertise them for sale (or for free!) or contact your local pet store or garden centre?
If not, some of your fish will certainly die at a relatively young age. If this happens then it would be better to let your remaining fish enjoy the space rather than buying any more.
Growing one goldfish to its full potential – possibly around a foot long! – is far more rewarding than keeping lots of small goldfish for only a short amount of time.
I am still trying with my tank. The ammonia has taken weeks to get to zero but my nitrite is still high. Any advice please?
To be honest, you probably just need to wait. Even after ammonia drops it could potentially be a week or two before nitrites then drop and you start reading zero ammonia, zero nitrite and high levels of nitrate. Keep testing for all three chemicals and your tank should cycle in time.
I have a 100L gold fish tank. Can I use a Fluval 206 filter?
Yes, you can. But we’d recommend the 306 if you can afford it. It’s better to go for a bigger filter and regulate the flow with the valve than buy a smaller filter and then find that it isn’t enough for your tank.