Although technically you can cycle an aquarium by adding something dead and letting it decompose, it is not my first choice. The typical cycleing process can take 4-6 weeks to complete, sometimes longer. A tank with no fish in it is not any fun. You should not add any live fish to an aquarium that has ammonia or nitrite present in it. With the method your trying, you may have an empty (no fish) aquarium for a month or so, it might take that long for the decomposing shrimp to be processed. and even at that point I question how stable your aquarium would be. Yes you can add live fish to a newly set up salt water aquarium assuming that the water parameters are correct ( S.G. is correct, 0ppm ammonia & trite, Ph of about 8.2ish, temp is stable, etc.) I feel the correct way to cycle an aquarium, weather you add live fish or choose another method is that on a daily baisis, add the same amount of "pollution" to the aquarium untill the nitrafying bacteria has populated it self great enought to neutralize the waste. In other words, If you added two fish and fed them daily the same amount of food, in theory your aquarium has had the same amount of waste produced daily and over a period of 2-4 weeks or so, the bacteria will reproduce into a population great enough to process the waste. Or another option would be to add the same amount of organic waste (not live fish) daily to the aquarium untill the bacteria has populated itself great enough to nutralize the waste. THe size of the bacteria population is directly revelent to how much waste is continually being produced. If you had 5 fish in an aquarium and the bacteria population was great enough to keep the water correct and you removed one fish, the bacteria population would decrease to equal the lower waste being produced and like wise increase if you added a new fish. What has been suggested to you is kind of like adding a really big fish for a few days, letting it pollute the aquarium, removing it and then waiting untill the water doesn't have ammonia or nitrite anymore. It isn't a good method. I would remove the shrimp. If your ammonia is at or below.2 ppm add a cheepie damsel or two and feed them sparingly. If it is over .2ppm, do a 50% water change or so to dilute the ammonia, then add a damsel or two. For the long haul, stock your aquarium on the lite side, the emperor 400 filters are great dirt traps but are not the greatest biological filters. Throw the bio wheels in your aquarium for an hour or so and then put them back in the filter. They sometimes take a long time to get fully water saturated when brand new. A protein skimmer is a great addition too asuming that it is a good quality model (lots of cheepie - lousy ones out there) Am I making any sence?