ok that means yout tank will be going through the cycle again, you are going to need to do 50% water changes every day without fail, or it is very possible you could lose all your fish.
You have far too many fish in there too, your tank sounds like around 15 gallons, which means you can only keep one large goldfish or two babies, also an undergravel filter it not enough for goldfish, especially in a tank as overstocked as yours.
you need at least 70 gallons if you are desperate to keep all your fish.
do you have a master test kit to test for ammoinia, nitrites, nitrates and ph?
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