grainthope and covenham

the green sand seemed to be getting plenty of insect food along the waters edge it was by the boat club gate as you go down the west side towards where the swifts were, dont think i have seen green sand in june at covenham before jim 

The green sandpiper is a good ‘un, Terry. 
In times gone by, I seem to recall there was generally algae at the water’s edge, but I no longer see it.
This makes me wonder if it is chemically removed by Anglian Water.
Would algae removal spell fewer insects and thus less food for small waders such as stints?
Or am I spouting nonsense?

grainthorpe, fem marsh harrier fem sprawk 3 buzzard 2 kes obout 50 mix of jackdaw rook and c/crow 30 swallows 4 swift 20 or so little egret 15 shelduck also present skylarks linnets yellow hammer 2 reed bunt sedge and reed warbler whitethroat 5 pied wagsetc
covenham 15 gc grebe few mallard tufted ducks 2 cormorants 3 pied wags 2 buzzard 2 yellow wags and a green sandpiper also linnets and about 30/40 swift mostly in the south west corner swallows covids etc terry whalin