ive been cycling my 100g tank with 45lbs of live rock. today my ammonia dropped to 0, nitrite at 5. i know how the nitrogen cycle works, but i am wondering what will feed the bacteria that converts ammonia to nitrate while my cycle completes? should i throw a shrimp in the tank or just leave things be? perhaps i should leave things be as there plenty of detrius all over the sand from scrubbing the live rock off.