Yes you'll need another source of ammonia b/c the die-off from the live rock will be some ammonia, but most likely not enough. The shrimp method is the cheap and easy, but it stinks...I used pure ammonia (you can get some from a hardware store). The cycle is not done until you have 0 ammonia and 0 nitrite, and your nitrates aren't off the charts. How I knew the cycle for my tank was complete was when I added the dosage of ammonia to the tank and if within 24 hours the ammonia and nitrite dropped to 0 then it was cycled. Don't add fish until nitrates are under control and as low as possible
! I added chromis when I had 20 ppm
of nitrate. Other fish (and def. inverts) will be more sensitive, but with a FOWLR
it's okay to have higher nitrates and phosphates than it is in a reef setup. One other thing (kind of random), is when your water evaporates, add freshwater because when the water evaporates, salt is left behind ergo raising the salinity. If you kept adding saltwater every time water evaporated you would be raising the salinity too high and might even kill your fish if it gets too high. This does not apply for water changes.