Maybe it's a problem with my computer, but the picture doesn't seem to be in the post.
From what you're saying this does sound like a water quality problem more than feeding. How long has this tank been set up? When did you last do a water change? Did you do it from the bottom of the tank? If you're using an under gravel filter have you blown it out recently? How large are your golds, on average, in length?
If it's been awhile since a water change, you may want to try a good half of the tank. Considering your heavy load you probably should be doing at least a quarter of the tank around once a week.
Out of curiosity, is the major tank for dramatic effect or are you breeding them?

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