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over the last few days i've lost 2 mollys to swimbladder..
1 molly & 1 swordtail not looking very good just now.
i've put the swimbladder treatment in the tank the only thing is it says i should add tonic salt to make it work better but i'm not sure if my catfish will like that..
tested water for everything and all is o.k.
8 neon tetras
2 mollys
3 swordtails
3 catfish
3 bengal loaches
4 penguin tetras
128 ltr tank

"Swimbladder" is a condition, not a disease and not in itself fatal. If you're losing fish to it, you need to look at what is really going on in the tank.

What is happening? What symptoms are you seeing? How did your fish die?

You have Neons in the tank - how are they? Are they discoloured? Whirling? Exhibiting any other symptoms?

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I like to think that whoever designed marine life was thinking of it as basically an entertainment medium. That would explain some of the things down there, some of the unearthly biological contraptions

IME swim bladder is due to a bacterial infection or constipation due to poor diet. In addition to Tiny Clangers questions, do your fish get a varied diet?

"Talk is cheap. Action can be almost as affordable"

neons are fine the mollys that died were sitting at the bottom of tank then a day or two later they were arched at the bottom of tank and when they swam about it was only for seconds and they were all over the place spiraling. i've had this prob before, my LFS it was a bacterial infection so i used meds for that i also got told it could be white spot before when i lost my clownloach's and treated for that ...that was about 6 weeks ago and the treatments were done in the correct time apart.
the only reason i'm treating it for swimbladder now is i always thought it was that but was told it only usualy happens in cold water tanks until today i was told by pets at home store it sounds like swimbladder.

a mixture of flakes, dried bloodworm and pellets for catfish but all fish seem to go for pellets anyway also ocasionally i give them brine shrimp and another live food i cant remember what its called

do u recommend another food that would help

It is almost certainly a bacterial infection. Spiralling is a classic symptom of overwhelming infection. If you were treating for Ich (Whitespot) you may have killed your bacterial filter, weakening your fish and givign disease a way in.

As you're in the UK, you will not be able to get antibiotics without a prescription. I suggest you begin dosing with Myxazin from Waterlife, the most effective bactericide you can buy in the Uk without prescription.

Also , up your tank cleaning routine. Do 10$% water changes every 3 days for a couple of weeks, cut down on feedings. Once the course of treatment has finished, dose with Cycle or another bacterial starter to boost the tank. Gradually space the water changes out until you are back to a routine of 20% every 2 weeks, but do this spacing slowly so that you minimise the impact on the fish of any possible cycle.

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I like to think that whoever designed marine life was thinking of it as basically an entertainment medium. That would explain some of the things down there, some of the unearthly biological contraptions

the whitespot treatment i did changed the water colour to blue for about 20 mins it also said on the packaging it wouldnt damage my filter the LFS said that too

i've also got a 58ltr tank i've been cycling for three weeks now all water checks are ok...do you think i should add my mollys and swordtails to this tank and then add tonic salt.

does any of the other fish i've got compatible with a salty tank

None of your other fish really appreciate high levels of salt, depending what species your catfish are it might even kill them, but there are a huge amount of fish out there that like a little salt , if not an entirely brackish tanks. Scats are quite gorgeous , and then theres some really cool stuff like archerfish, although they will easily outgrow a 58l, but if you were planning to upscale at any point you could bear them in mind.. Might be a nice idea to look up other species that can handle the kind of water found in mexican sinotes for example, there are sailfin mollies for instance, and a few species of characins.

Id concur with the deaths being either chemical or bacterial though. Might be worth checking the heating equipment is working too.