The one closest in the picture is planted in one of A pot for pots kits. The one in the back is planted in my own mixture using black gold natural and organic potting mix plus fertilizer that also has some peat moss mixed in as well. So far both of them have continued to grow at the same rate. I recently started paying more attention to EC/PPM/TDS readings. Currently using the Bergmans grow fertilizer kit that recommended putting a surprisingly small amount of fertilizer in. My EC is 837 us/cm and PPM is 423 in most of the water I'm putting in.