Ponds and pond care

The garden thread is the main one: https://www.lfgss.com/conversations/176057/?offset=13100#comment17422530

The allotment one less so: https://www.lfgss.com/conversations/168422/?offset=4850#comment17423024

Do we need a dedicated thread?

As for your actual issue;

1. You don't want too many nutrients so grab some wellies and clean out the green stuff and dig out the excess silt. Leave this next to the pond for at least 24hrs before putting it in your compost/similar to allow things to return to the water.
   
2. Get some oxygenating plants in there (pretty sure nowadays people say you don't need pumps with the right plants)
   
3. Add some sort of perch for dragon fly
   
   

There's a 'wild your garden' guy on YT who has good tips on plants etc. https://youtube.com/@wildyourgardenwithjoelashton?si=t7lM7gSQTo12xoZ3
You'll want the speed set to at least 1.25 cause he loves a tagent, but browse his video list for something that fits
https://youtu.be/jG1w7MUhhXs?si=NVLnPji4G5Wk0QG9

Edit here is the first in a series of how too:
https://youtu.be/lKrjMv6TMlU?si=-S4OQcP5iYN8qg9D