Howdy and welcome, Mortimer.
If that is all the thicker the algae gets, I personally douibt it has caused a problem.
Do you have any fish in the pond besides LMB? I don't know if anyone can sex a small LMB without a good picture of the uro-genital area. Myself, I know it's a female if it's full of eggs prespawn.
Thanks a heap for taking the easy one and getting it right, BarO.
