I have a large (50cm+) leaved sword in my tank. It has produced 5 or six large broad leaves which reach the top of the tank. Only trouble is the plant looks to have stopped producing new leaves and the older leaves are getting algae on them due to their proximity to the lighting. Can i prune this plant back to the crown and will it send out any new leaves again? My worry is that i am left with an ugly looking set of quite thick stalks and no new leaves and the plant dies? Do leave a couple of leaves on it?