Here is some information that I found on swim bladder disorder. What type of foods are you feeding them? Also have you noticed if the fish is pooping normally? It is suggested with swim bladder disorder to try feeding more fiber and less protien. You may want to try feeding your fish a pea, frozen peas will work. Put one in a cup of water into the microwave for about 30 seconds, let it cool and pop the inner part out of the shell, mash up the inner part and offer it to your fish. Peas are good with helping with constipation. The following info is from the site here under the freshwater and saltwater disease thread.
Swim Bladder Disorder
Symptoms:
Limited signs of bloat though usually no physical damage is found, fish struggles to balance itself sometimes going “belly up” due to lack of proper buoyancy
Causes:
Often indigestion with
Goldfish, blood parrot cichlid and “balloon” strains becoming more vulnerable to the disorder rather than most fish species, bacterial infections, damaged swim bladder, the use of floating foods which when ingested allows entry of air to the digestive system, congenital or development causes, birth defect, sudden trauma from sudden changes in water conditions or failure to acclimatize the fish properly.
Causes can be difficult to determine although possible causes are often leaned on the use of floating foods, indigestion and damaged organs by assumption. It has long been argued that floating foods should never be used at all especially for
Goldfish. It is in the best interest of the safety of the fish that sinking foods be used instead of floating foods or try to squish the foods until they sink.
I’ve personally seen the crossbreed of the parrot cichlid and flowerhorn struggling to swim properly due to its balloon appearance. It will always be noted that balloon strains are rather deformed and should be avoided at all costs. Their vulnerability for this disorder renders them incapable to live a longer life span in comparison to the normal fish species.
Treatment:
Change of diet with foods containing high fiber content, fasting for several days or antibiotics. Unfortunately, there is no cure for such disorder although in some cases, the fish can recover depending on the cause of the disorder. Fish that suffer from this disorder due to sudden trauma from improper acclimatization usually will never recover at all. In this case, it is recommended to destroy the fish.
Read more:
http://www.tropicalfishkeeping.com/...-saltwater-diseases-8179/page4/#ixzz1Y8a9qKsF
I found this info on another site, basically says the same as posted here
Swim Bladder Disease
Posted by
Admin on January 27th, 2009
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General Information
Swim bladder disease is most often noticed when a fish floats at the of the water, or a fish that stays on the bottom of the tank and doesn’t seem to be able to rise easily . A fish that has normal buoyancy but is laying on one side or the other does not mean it has swim bladder disease, but could have other diseases. The swim bladder is a small epithelium-lined sac in the abdomen and is responsible for maintaining buoyancy in the fish. It has a close association with blood vessels so that gases can move across and in and out of the sac according to the fishes needs. The sac inflates when and if the fish needs to be more buoyant, and it will deflate when the fish needs to be less buoyant.A few different things can cause swim bladder disease.Some of these include, A Virus, Bacterium, And diet.
Diagnosis
Fish that have swim bladder disease appear to have an abnormal swimming pattern, usually with the tail end up. The fish may even float upside down or look to be stuck at the top of the water and unable to swim down, or sometimes its the other way round and they may lie on the bottom of the tank,and then are unable to rise to the surface of the tank. Fish that have swim bladder disease will continue to try and eat,with a normal appetite.The most common cause of swim bladder disease is improper diet. An improper diet can end up leading to intestinal gas or intestinal blockages. Intestinal blockages can irritate the bowel, which gives bacteria or other parasites an entry point where they can cause damage to the fishes swim bladder.Fish that are fed a lot of dried foods, like pellets, are more likely susceptible. This condition is frequently observed in the later stages of
Malawi Bloat, which is normally due to an improper diet as well an intestinal irritation.
Treatment
This disorder is due mainly because of an improper diet, a change to their feeding needs should be made. Dried food that contains lots of protein should be kept to a minimum. Pellets and other dense foods should be soaked before feeding or completely removed from their diet. Food contains alot of fiber should be introduced, such foods include zucchini, squash, spinach,lettuce, peas, and grated carrots. If you think that your fish is a victim to a bacterial infection, treat the fish with some sort of medicated food.
Hope this helps, also you should check your water parameters if you haven't yet, levels for ammonia nitrite and nitrates.