Our system is doing well after the first three months. The plants are doing okay, but I know they could be doing better. We only get a few tomatoes, but the lettuce does well. Spinach is still a challenge. So, what, if anything, should we be adding to the system? Or do we just need to be patient and let the system mature? We have 25 channel cats (6"-10") in a 275 gal IBC, 4 IBC gravel beds and now 80 sq. ft. of DWC.
if you're seeing a specific "deficiency" then target that..
but for a general tonic, maxicrop with iron is all i use.. if you have access to worm tea, it can be used, i've seen several good posts on that subject
What's your pH??
You should be doing fine then.... you can supplement trace elements by using a "worm tea"... or by using Maxicrop"....
Your system will "mature" over the next couple of months...