Hello, I am new to this whole reefing world so dont laugh at my question please. I set the 75 gallon system up without LR and LS and began the cycle with a piece of shrimp. I removed the shrimp after 3 days.I have checked the water ever day. On day 5 I began to see ammonia. I am on the 13 day of the cycle and it appears the ammonia is starting to fall off. My question is should I feed the aquarium or not? Thanks for your advice.