if your doing a fishless cycle you need to put the pure ammonia in or the cycleing will never happen. As far as addind anything to absorb the ammoina in the water the answer would be not until the tank cycles and you add fish but than only if you have overstocked the tank. With the fishless cycling don't do anything just let the tank run.... let the bio coclny build up, doing WC will only slow the process down and with not fish in the tank there is no safty issue.

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Gold Coast Aquarium Society South Florida
[url]www.goldcoastaquarium.org[/url]