The other day, I realized I have 2 containers of NLS all purpose formula that I forgot I had stored in a second refrigerator. One is opened, but has had the lid on, the other is unopened. I had originally bought this for my community fish, long since gone, but I noticed that the ingredients are very similar to that of the normal 1mm cichlid formula, including 34% protein. It has been in there for 18 months plus. I took the lid off the opened one and it seems to smell normal. What do you think, good or no good?