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My fish are all death and i want to start again but i don t want to get the next lot of fish sic so i want to desinfect but i don t know how.

Empty the tank and rinse it out. Cleaning out a tank and then drying it is a pretty sure way to get everything out of it; not many aquatic organisms can take being dried out. Some people recommend stuff like bleach (mix bleach with water to dilute it), and after that you have to rinse out a lot to make sure you get all the bleach out.

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The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian.

Maybe tell us a little about the tank you have as well, what sort and the number of fish you kept in there and how did they die(disease, fighting, etc).

This will let us help you set up better next time, so this doesn't happen again.

Good luck

For things like nets, I like to rinse them in vinegar then again in clean water, then dry them. The vinegar leaves them sweeter smelling and kills the algae spores.

I would recomend using chlorine to disenfect the tank before starting again. After wiping out the tank with chlorinated water. Rinse it good with warm water, set it up and fill it using a good dechlorinator. Bleach to me is slimey and harder to get out.

17 years experience with freshwater.

Bleach basically is chlorinated water.

I agree with Shini. Let it sit dry for a week or so. If you're feeling particularly wary of putting things back in there, make up a 1:10 bleach to water solution and scrub it all down. After that, rinse rinse rinse until you think it's all out, and then rinse it 3 more times. Fill with clean water, use a dechlorinator, get an airstone running in it, and all the chlorine should gas off or be neutralized. Set up tank and season to taste.

honestly i think we all have our own specail home made way of cleaning,but i try not to use anything harsh like bleach or cleaning products,i have toothbrush,scrubing brush,and a sponge,that i only use on my tanks,filters and decore,nothing else,and all of these have never had any chemicals in them,beleave this or not,i use plane old salt,out of the kitchen,and coca cola(coke)from the fridge,i found the coke frys of all the gunk,and the salt frys out any nasties,also i think the 2 fizz up well,and this is why they do work,and you can get coke or salt from just about anywhere,on one tank i did use my high pressure washer,but i dont normally recomend this,i only done it,because the tank that i got,was in very bad nick,so i blasted it out,and blasted most of the silicone away,but i wanted to reseal it,cause it leaked bad....so it worked out well,but if your silicone is fine and water tite,keep the HPW AWAY FROM THE INSIDE OF YOUR TANK...hope this helps

ps,listen to what cavey said,this is very good advice...