Help! Fantail goldfish floating!?

It sounds like you didn't 'cycle' your aquarium first, before you bought the fish. Also, you are way over-stocked!! You need about a 100 gallon tank for all of them. Plus, a high-quality filter that can clean 200 gallons of water per hour. Goldfish grow to about 15" - 24" in length. You have to vacuum the gravel weekly , or twice weekly, with Goldfish, as they produce a lot of feces. They always want to eat. They don't have a stomach, so will eat as often as you feed them. Feed them once per day. And only a very small amount or you will have a terrible mess on your hands trying to clear up the water from all the wasted food and feces. As for the floating fish, give him frozen peas from your freezer - take about 8 - 10 out of the bag, hold them under very hot water to thaw them out, and peal off the skin. Mush them up in your hand, and put in the tank. This often helps. With all the food you are giving it, it is probably constipated. I would not have bought the snails, as they multiply like crazy, and it's hard to get rid of them. Plus, they leave a lot of dirt behind, like Goldfish do. You said you are getting an air pump shortly. You should have had it before you bought the fish. It takes about 6 weeks to prepare your aquarium's water quality, BEFORE you get the fish. For a ten gallon aquarium, not a Bowl, you should only have one Goldfish in it. As your tank is 'cycling' , be prepared that you may lose some or all of your fish, due to all the toxins in the water during 'cycling'. Also, the slim Goldfish, (Comet) should not be in a tank with the other, slower Goldfish. You don't mix single-tailed Goldfish with Fantails. The bug-eyed fish, if they are black, are called Telescopic Black Moor Goldfish. You must change 25% of the water, DAILY, until the water clears up in a number of weeks. If you don't want a real messy tank, take out the plants! Only use plastic plants with Goldfish, as they shred the plants to pieces, which causes an awful mess in the aquarium. The Misty water problem, is the tank 'cycling' itself. While this is happening, NO fish should be in the tank. So, be prepared on very likely losing a lot of them.