Odd...my sulawesi looks like the OP's pic...even under very high light. The plant also liked growing straight out of the water too. The stems on my sulawesi also ended up about 1cm thick and the leaves about 3" long each...I suppose that's mostly because of tank conditions though. The stem also remained green.This is my L. sp. 'Sulawesi' under t5 lamp. The leaves are only 3 cm long.