Brown surface on pond water

I can only say that surely the fish are eating the plants young growth? If you had green algae on the top I would recommend barley straw. Sorry not to be of more help!

you can take the scum off [probably a type of algal bloom] using newspaper layed on the surface and folded back, or kitchen towel but depends on the size of the pond.
are the lilies too deep? different species grow at different depths. if it is a shallow species and it is too deep it cant grow adequately to the surface. so try bringing it nearer to the top. stand the basket on a ledgr or on stones/bricks. and some lilies do have bronze/reddish foliage.

it is still early in the year so the oxygenator might not be growing well yet. mine has only just started moving in the last week or so.

hope this helps.

i would give the pond a large water change.net out the brown scum .i always put new young lillies high in the water till they take hold and grow.you dont say weather your pond is coverd or shaded bye anything.theres a lot of factors .we need more information to find a possible answer.higher plants should eat the nutreants that alge likes and block out the sun.theres no chance a kiddy has dropped something metal in your pond.have you got moving water ?

I agree with the suggestions to do a partial water change, although I would be careful to dechlorinate any incoming water.

I use a fine net to remove debris from the surface of my pond, but it takes ages when I have tadpoles as I have to check it all very carefully and put the caught tadpoles back!

If the scum is on top of the lily leaves it will kill your plants by blocking out the light they need to photosynthesise.

I have heard you need to cover about 1/2 to 2/3 of your pond's surface with water plants to remove the problem of algae blooms.

my ponds coverd with a pagoda with bamboo i get no alge.it realy does need a lot of sun to bloom.it takes about 24 hours for clorine to leach out of the water.