So a few days ago I noticed my tank had a little bit of algae on the bottom and on my decor. But I did'nt think much of it. Yesturday I noticed my 3 goldies were acting odd. They were darting around the tank a little bit, then staying very still and hiding. So I figured this was them telling me there was something going on in the water. So even though I cleaned it not but 5 days ago, I decided to do an early cleaning. Cleaned the gravel, did a 60-70 water change, de-algaed the tank with an old tooth brush and used stress coat.

Well there's be no improvement in their behaviore and I'm starting to worry. All 3 float around near the bottom or in the corner and if they do swim around it's very slow and almost jerky sometimes. They seem to act fine but only when I try to interact with them, but then they just go right back to floating. Then sometimes they'll randomly dart around the tank and hide like they're suddenly startled. They clamp their fins a little and Larry my big common is missing more scales.

Here's some more info...
10 gallon tank (Yes I know it's small. I'm still trying to work on that.)
3 goldfish, one common and  2 comets. Average size, 2 inches with the biggest being about 3.
Stress coat +
Aqua Clear power filter 100 GPH
Set up for 4-5 months.

I don't know what suddenly went wrong. I hope it's not something I did....

With that size of tank I'd be doing a water change 2 to 3 times a week....your fish are poisoning themselves, as they grow they are producing more and more ammonia, and your tank can't dilute the concentration....do more frequent water changes and add an anti-spike buffer such as Tetra Easybalance.....and get a bigger tank asap

Good luck with the job! I agree with scrivens, they need a bigger tank, as you know. The water quality is not stable in such a small tank. A small quality issue quickly becomes dangerous. Definetly change the water more often. When you look for the water test kit try to find API master kit. Don't pay too much for it though, I have seen it in petstores as high as $50! You can buy online for $20.

I hope the little guys start to feel better soon!

I agree with what everyone's already said, so good luck
Let us know how things go!

Waiting for an answer to one of them applications here too @_@ If they could only be a bit faster.. xD
Let's hope the tank will be sorted out for a while now C:

They're so cute! Glad they are back to their normal happy selves! They seem full of energy!