cloudy water new tank

Question
i have recently set up a 90 gallon tank with cichlids . there are 5 cichlids in total , now we put them in the water , everything was going ok , we let them settle in and claim the territories they all wanted and then i fed them , now i fed them twice in one day ( have had fish many times i don't figure i over fed ) and their water which was crystal clear has turned cloudy ( fed them once in morning once in afternoon and by night time water is cloudy ) i have a great big filter brand new , now is this something to do with the bacteria not being right ( guy in the fish store said to help with bacteria to use some of the water that our new fishes were transported in  ( he said use 2 of the 5 bags of water to help with bacteria ) . any advice as to what i may have done wrong or how to fix this problem ? max flow rate for this fliter is 500gph it is an "aqua clear" 110 power filter. Any help greatly appreciated and thanks for reading this .

Answer
Ok...here we go.

Cycling is what we call when a new tank is being broken in. It usually takes 6-8 weeks.  Fish poop, and this dissolves into ammonia.  ammonia is deadly.  Eventually a type of bacteria grows and eats the ammonia and turns it into nitrite.  This too is deadly.  Another bacteria eats the nitrite and turns it into nitrate, which we remove from the water with weekly 50% water changes.  The bacteria grow in the filter.  There is little to no bacteria in the water. The petstore guy was badly mistaken in telling you to use petstore water.  You should never use water from a petstore, as most of them carry parasites.  do you have any other tanks in your home?  If so, take one of the filters/sponges etc and squeeze it over your new filter.  This will seed the tank and help get the cycle going faster.  Do this every 3 or 4 days for a while.  In the meantime, I would buy a water test kit (liquid reagents, not dipsticks) and test your water once or twice a day until you get 0 ammonia, 0 nitrite, and under 10 ppm nitrate.  If your ammonia gets above .25 change 50% of the water. If the nirite gets above .25, change 50% of the water.  Do weekly 50% water changes.  I have two theories on why the water goes cloudy after feeding.  
1.  The food you feed disolves in the the tank and the cloudiness is dissolved food
2.  A bacteria bloom, which means your tank is trying to cycle

Untill you are done cycling, I would only feed food every other day or so to limit the amount of ammonia put into the tank..  

Good luck and if you need more help, feel free to followup