I agree, FISH OVER LOAD! At this point once you rid yourself of
the excess fish, you may need to start the initial cycle process
from scratch with fresh water. No telling how long it would take
for water that dirty to cycle.

First, STOP SEEING YOUR CURRENT SALESMAN! It's apparent he has
no clue what to do. His only interst is to sell you things.

Visit these links for more info:

http://faq.thekrib.com/begin.html
http://faq.thekrib.com/begin-cycling.html

It will give you a very good idea what you need to do. Be sure
you rid the water of Chlorine BEFORE the fish swim in it and buy
yourself some test kits for ammonia, nitrites and nitrates.

Mark