Help what killed my gold fish?

Sorry to hear about your fish, it could have possibly been that you overloaded the filter. When introducing fish to a new tank you have to do it gradually for the filter to cope properly with the amount of fish waste especially for goldfish as they generally are dirty fish. For every new fish you add you have to allow the tank and filter to cycle therefore getting the filter used to the amount of fish waste, I normally wait about 28 days to a month before adding the next fish. Adding too many fish too soon (all at once) will create high ammonia levels from the waste which will poison the fish. Hope this helped. Good luck next time. :)

Your fish more then likely died from a mixture of the stress and filth of living in such small spaces. Goldfish are highly dirty fish, and when kept in small bowls/tanks the dirt tends to accumulate, and it will eventually cause all of your fish to become diseased. Do you know what type they were? Because if they were a type, such as comet goldfish, that are often used as feeder fish, they may have been kept in a small and dirty tank from the get-go. Very sorry about your fish. ;(

like all fish, goldfish get stressed when they are cramped in too-small spaces with too many others... that might have killed them. another cause could be that since goldfish usually carry diseases, and since they were so close too each other all the time, one diseased fish could have contaminated all of the goldies... besides that, i can't think of anything sry for your fish

Hmmmm............... really strange............. really mysterious................ Did you ask your son? Sorry couldn't really think of any other cause.

Hi. I'm sorry to hear of your loss-I understand how upsetting this is for you. My first guess is the new fish were carrying a disease , if your Goldfish were in an already weakened by poor water conditions this could have triggered their demise.Best to do a Google search. then research it & also join a forum dealing with that type of fish. Another point to be aware of is tank lighting, this should never be allowed to stay on for more than 8 or 9 hours per day & even that is excessive unless you have real plants growing in your tank. Fish don't need artificial lighting if they have ambient light coming into their tanks from a window so a couple of hours a day for viewing purposes is adequate, a light on constantly deprives the fish of valuable sleep making them listless & lethargic.. There are several other possibilities for your fish dying, I'm going to assume you only have a small tank Do you do regular maintenance like partial water changes & gravel vacuuming, also do you have a filter? If not then poor water conditions may have been the cause, you will need to invest in a test kit for your water parameters to keep an eye on this. Goldfish produce an immense amount of waste compared to many other types of fish so they need large, filtered tanks to keep their living environment clean-otherwise they are simply swimming in their own waste & will suffocate. I would strongly advise you to refer to the attached link regarding Goldfish care if you plan on getting any more [you'll need a separate tank!]-despite what many people believe they are not a particularly easy fish to keep & like any pets for young children we should be prepared to put the hard work in ourselves!! Although some Goldfish are only pennies to buy it's the equipment needed for their care that cost the money, a couple of Goldfish need at least a 20 gallon filtered tank with a fitted lid. Properly care for Fancy Goldfish can live well into their teens, Comet or Common Goldfish can easily live 20+ years & grow over a foot & half long.