My current system at home has-been running for about 2 years now and we are getting great result in both our raft and media beds.
A friend asked me to build him a small hybrid raft media system,which I did. The media beds have been running for just over a year and are doing great. I built the raft beds a few months later and they have been running for about 6 months. they started off well and have just gone down hill ever since. Everything is super deficient, and they are not growing well at all. There is a bad leaf hopper and thrip outbreak that I am trying to get under control but i don't believe that is the only problem. the root growth is also horrible. the system is exactly the same as my home system so I just can't figure out what is wrong.
Any help would be great. I am attaching photos below.