Good Morning!!

I have six plants- all about the same size and cared for identically, all in the same tray for convenience in moving them when necessary. This one has brown tipped leaves and even lost a couple leaves in the last week. The others appear to be fine so I can't figure out what is happening. Please tell me - and maybe even give me some advice as to how to correct whatever it is I'm doing wrong. Here in central western Florida we have had torrential downpours but I bring them into my carport to avoid the excess water.

I have ordered seeds from Mr.Ko but I'm keeping quiet about it (shhhh!) in case I really screw it up so don't tell anybody.

Thanks for any help you can give me. Ed V. Clearwater.