DNR is now working on new pond guide to say keep 18-24 inches. It will also mention "new" water soulble fertilizer. THisis much easier to use than granular. Where are you located?

It is overfertilization. Treat the green film with 2% solution of K-tea or smiliar copper based liquid algaecide. You should not neeed more than a quart of product ot rid of this.


Greg Grimes
www.lakework.com