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Very nice. I've never seen water hyacinth has flowers but so over grown and i wonder if it will be a problem.

thanks @ace108, i want to tell you
water hyacinth like a fruit simalakama, hehe
water hyacinth has benefits and disadvantages for water. water hyacinth can be beneficial to purify water and absorb heavy lagomes,
but I think that as much as it will be a problem because it has closed the surface of the water and the sun can not enter its depth, and the dead haze and decaying water hyacinth also cause siltation in the waters .

Yes, I heard it depletes the oxygen from the water which may a problem for the life under the water.

Yes you are right @ace108, too much water hyacinth like that will obviously reduce the amount of oxygen for under the water life, If not soon overcome this can cause evapotranspiration which means the amount of water loss will increase due to its growth so fast and has wide leaves.