You probably just disrupted your cycle; you're never supposed to fully empty a tank and clean the gravel. Remember what a pain cycling the 55 was? This tank is going to have to do that again, and it's going to be really hard on your stunted goldfish.
This is really frustrating for us, please understand that.
You. Can't. Keep. Two. Goldfish. In. A. Ten. Gallon.
I bet it was nasty in there, because they make a ton of waste. DO NOT put an algae eater in there, it will only make more waste and make your situation even worse.
Please take our advice, we're trying to help you out.
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current setup:
5.5 gallon low-light planted tank
-nothing....thinking a mini-community.
for reference: my name is Julie 
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