riddle me this. my tank has been up 2 years. i have lost many fish over that time. About 12 weeks ago i decided to remove the last fish a wrasse. i have had it about 3 years, this was due to advice that perhaps i need to go fallow. i have snails ,crabs , shrimp and coral they are all fine. i tested today and ammonia is at .4 maybe more and nitrate are at 0 . that aint good. How do i fix it looks like a cyle issue although it has been running a long time.

