Re: clowns problem
KMACAS,
Personally, I would only keep one pair of clowns in a given tank. The number of fish you have in your 50g is far too many and is the cause of your ammonia problem. It is also the cause of the fish deaths and the cloudiness in your tank.
Immediately, I would remove all but two clowns. Either return them to your lfs or put them in other tanks that are well cycled and that can handle the extra bioload. I would also do a large water change (40%) to reduce ammonia. Normally, I would not do large water changes, but ammonia at .5 ppm is toxic to your fish and this is what is killing them.
After you have gotten rid of the other clowns, I would keep monitoring the ammonia. Do water changes to keep it as far under .25 ppm as you can. This may mean that you're going to be doing water changes daily for at least a week, probably longer.
Ammonia at .5 ppm will also greatly affect the health of your anemone, so it is imperative to keep ammonia levels as close to 0 ppm as possible.
Sounds like you are new to reefkeeping. One quick word of advice and that is only add one or two fish at a time. Depending on the adult size of the fish you want to keep, you should only be keeping about 3-5 fish at the most in a 50g.
HTH.
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