I have a 12 gallon nano cube that has been cycling for about 2 weeks now and the readings show that It's already cycled; A = 0,n=0,n=0 and ph=8.2. I have 10 lbs. of liverock and about 16 pounds of Arag-alive reef sand. Can I add two small true perculas and maybe a blood shrimp in there? I...