Large Oranda Goldfish HELP! :(?

Your fish should be in atleast 10 gallon tank. You cant add anymore fish. Try saving up again for a bigger tank. And make sure that the filter is strong enough. Like for example u already have a 10 gallon tank your filter should be for a 20 gallon tank. Goldfish produces too much waste so you need a better filter. Dont forget to siphon filter your tank once a week.