Jenste, I hope you see this!!

So this is for my froggies Zig and Zag. They are doing much better now that I changed their environment a little.

I kept the same tank (2G) and added a water heater
I changed the water, so now it is fresh and clean
I have a bottle of stress coat and dechlorinator
I got them some new food pellets.

The dechlorinator the pet stroe had and reccommended looks like iodine, i used it the other day and I had to clean the whole tank. It made the water nasty, the directions suggested 2-4 drops/g so I used 6 drops,and it still made the water tinted iodine-like.

Is this normal?
Should I use less of it?
Should I change the product?