Is it possible for a tank to completely cycle in 2 and a half weeks? It's a 36g tank with live sand, 36lb of live rock with plants growing on them. Also have few turbo snails, white legged hermit crabs, peppermint shrimp and a damselfish (only been in tank for 4 days). My ammonia, nitrates, and nitrites are all 0 and spiked a little last week. My PH is 8.0. Think it's safe to add more fish besides the damsel?