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Sounds like swim bladder, most likely. This occurs in goldfish a lot when they get too much protein/not enough vegetable matter and their digestive tract gets an impaction. Begin feeding your fish peas exclusively for about a week and it should be ok and then make sure your fish gets plenty of...

Goldfish don't get pregnant, they lay eggs. Swim bladder symptoms are the fish not being able to maintain its equilibrium, meaning it will swim on it's side, upside down, and generally not be able to stay in one place easily. Some goldfish look bloated by their nature. Look up pearlscale...

It should be ok, since the goldfish shouldn't fit in the bullheads mouth, and the bullhead shouldn't fit in the goldfish's mouth. I see bullheads in koi ponds all the time.

The fish need to be removed first. When you begin taking out the sand, gasses that may be trapped in it will be released and may kill your fish if they are left in it. Removing the sand will affect your biological filtration, though, since a lot of the bacterial colonies are on it and many...

Get a bucket and a gravel vacuum for your water changes. Remove about 2-3 gallons of the water into the bucket. If you get a pleco, get a candy stripe pleco(max. size is about 4") or a rubberlip pleco(max size is about 5"). Neither of them are particularly good algae eaters, though, so Otos...

Goldfish and the fish you listed are not compatible. Fan-tails and Koi shouldn't be kept together, either. As for the food...goldfish/koi should have a diet that is only about 30% protein. Tropical flakes tend to be too high in protein for goldfish, even goldfish flakes are too high in protein...