03-27-2007, 05:16 PM
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probably from bad water parameters, a goldfish wont live long in a 5 gallon tank, many people follow the 10 gallon rule, i follow the 30-10 gallon rule where start with a 30 gallon and no less with 2 goldies no more, then use the 10 gallon per goldy rule. So 30 gallons hold 2, 40 gallons hold 3, 50 gallons hold 4 etc.
Whats the temp of the tank, goldies should be kept in the 60's, if the temp is in the 70's+ then the fish will suffer oxygen deprivation.
Any natural light?
there is a sticky at the top of the thread, read that and answer the questions, that way we can help more :)