Tell e'm Rose......
Sounds like you are on the right track. if the tank is new and you did use old tank water this will help. 9somewhat) becasue if all you used was water there isn't or wasn't enough bacteria in it to keep the new tank from spiking / getting cloudy. now, this is common with new set-up depending on set-up method used.
I still from time to time get a cloudy tank. but most times it is due to stupidity / rushing on my part. Normally this clears up within a week or so.
Adding some carbon as mentioned should help. Is there anyway you can use the same filter from the original tank? Even get some gravel from the same tank? This will help the bacteria colonize becasue if the original tank colonized all the good stuff is in the filter media and in the GRAVEL.
just a though .........
BEFORE you add the fish:
make SURE you add some kind of water conditioner. Even though if the water has been sitting WITH the filter the chlorine / chlorimine will / does avaporate. When i do water changes i set buckets outside in the sun and this in itself helps detoxify the water from the added human pollutants that to the fish will harm them but is suppose to be good for us humans. ??? Go figure ??? Wait, i'm NOT human I am a fish.
what am I saying.
try NOT to overload the tank once it is ready for the fish this can / will cause not only cloudy water but a spike in amonia if fish start to produce more waste than filtration / bacteria can handle.
This is the most important part prior to introducing the fish. be sure you check the water and add enough filtration to maintain the proper amount of fish.
Alright time to go .......................
Danny
hope this helps somewhat at least.