Can you please take a look at this thread: http://www.aquariumadvice.com/forums...ve-265871.html
The first fish are fluid telescopes. They have 'telescoped' (protruding) eyes with fluid filled sacs around them. Also pictured are some moors later in the thread. They also have telescoped eyes. I do not have true bubble eyes as they are too delicate and have too specific of care needs. True bubble eyes have fluid filled sacs that float at/above their eyes. Does this help ID your fish?
Ok, you need a new test kit. And a bigger tank for the goldfish (30+g). 10g is too small for any goldfish, even a baby. I suspect your tank was already stocked with the cories but as I do not keep tropical fish (which should not be mixed with coldwater goldfish), I can not say this accurately but right now, the tank is heavily overstocked.
As it stands, I suspect your ammonia levels are quite high and the issues your having with goldfish are the direct result of this. I would start doing 50+% water changes (wcs) daily until you can address the tank situation. The ph of 7.5+ is a nonissue for the goldfish as they do best in high ph, hard water. The issue is ammonia is more toxic at high ph levels so big wcs daily will be a must here.
In the future, keep the liquid tests under lock and key. Kids should not have access to them or be playing with them- ever. The ammonia and nitrate tests are considered harmful with bottle 2 of the ammonia test being dangerous and can cause chemical burns, eye damage and corrosion (among other wonders). This is coming from a mom of a very inquisitive 4yr old who likes to help with everything fish-related.
Please check out the link below as well- it covers most basic info on care, feeding and other concerns in respect to fancy goldfish. Please ask any questions!