Yeah, the fluid suggests too much feed but from what you said they don't get too much. Hmmm....interesting!
Have you trie to contact your counties extension office? Or a state university. They may be able to help. Other than that nor sure what you should do....wish I could be more help.
Have you trie to contact your counties extension office? Or a state university. They may be able to help. Other than that nor sure what you should do....wish I could be more help.