What test kit are you using that will detect 0.02ppm of ammonia?
This is the key question. Unless the OP has some lab-grade material, no off-the-shelf aquarium home kit is anywhere near accurate enough to measure hundredths of ppm.
i suspect it's a typo and it's 0.2ppm
LISTEN I"M NOT A PROFFESTIONAL FISH KEEPER, i do not know all this stuff, should i just quit my job and start keeping fish all day as my profression??? I need money to get all the stuff to care for all the fish and keeping them will NOT give me money to buty this kind of stuff. I CAN'T DO WATER CHANGES EVERYDAY!! I NEED ANOTHER SOLUTION RATHER THAN JUST CHANGING WATER ALL THE TIME!
right, the tank is not cycled, there's no magic fix we can give you to make it be cycled. The first thing you need to do is make sure you understand what cycling is and what the levels we are talking about are. read the link in my sig 'whats cycling' which will explain all this to you. You may not be a professional but if you aren't prepared to take 10 minutes to read this stuff through then you shouldn't be keeping pets at all.
now you need to bear in mind that the usual problem of a fish-in cycle has been compounded by the fact that you've got discus, they are one of the most delicate sensitive fish around and shouldn't be kept in a tank less than 6 months old, it needs to be mature and stable to keep them happy and alive. I don't mean to be the bearer of bad tidings and I'm not trying to have a go at you, just being realistic. There is a very strong chance that your discus will die if you keep them in this tank.
So, onto fixing it, easily the best option for you is to return the discus to the store and complete a fishless cycle, there is a link in my signature which explains how to do this as well. This means that the fish will not be put at risk by your water conditions and that you can prepare the tank properly so when you are ready for fish they have a safe environment to go into. This is not an expensive process, all you need is a bottle of ammonia which costs £2/3, it does however take a few weeks so you need to be patient.
There are a few alternatives if you are not prepared to do this though, the first is daily water changes, this will go on for around one to two months, you'll need to change about 50% of the water every day to keep things clean enough for discus. Basically you need to do as many water changes as it takes to keep both ammonia and nitrite at 0. Even 0.1ppm will be v dangerous for discus. During this time the fish are highly likely to get ill, this will mean buying appropriate medications which can become v expensive, diseases are hard to treat when there's ammonia present in the tank so the chances of recovery are slim. There are however a couple of things you can try to speed this process up.
The first is to buy either Bactinettes (UK) or Bio Spira (USA), these are 'bacteria in a bottle' supplements which contain some of the good bacteria you need to keep your filter healthy. There are however no guarantees that these will work, they are expensive and probably have something like a 50% sucess rate. Don't buy any other bzacteria in a bottle products, most of them don't work, the two products mentioned above are the only ones that real fishkeepers rate.
The second option is to get some mature media from another fishkeepers filter, this will contain the bacteria you need and will speed up the cycling process.
So you can either go for the cheap option which doesn't involve daily water changes i.e. return the fish and doa fishless cycle
or you camn try and do the daily water changes to doa fish-in cycle, potentially loose your fish and most likely have to spend a lot more money rectifying problems.
