Soggy lily flower buds
 

HI all. I have a problem with my water lilies. Got a couple of pretty flower heads but I also had several mushy flower buds that just were floppy in the water. The plants along with soil, rocks and water are in a large plastic container which I put them in early last year and I had the problem last summer too. Don't know where I'm going wrong. Also seem to have loads of lily pads which cover any pretty flowers so I am removing some of the pads so I can see them. Also have some of that green slimey blanket weed which I remove every other day. Would appreciate any advice, thank you.