snide:

Kens advice is right on. I wouldn't fertilize. Lots of algae means that you have excess nutrients, adding more is like pouring gas on a fire to put it out.

I'd look for good non-invasive pond weeds to put in the pond to help with utilizing some of the nutrients. Something that you can keep under control, and something that grass carp like to eat. That way you could toss some in if the weeds get outta hand. If it's in the budget, it seems like you pond is the perfect poster child for Tilapia. Rex is supposed to be making a run in Indiana the next week or so with them, PM him and see if you can get on the delivery list.

Mother Nature is growing algae in the pond to tell you that there are too many nutrients, and is growing algae and cattails to utilize them. You will have less algae if you can get something to remove the excess nutrients. The cattails did that, but you've seen their bad side. Green Clean Pro, or Phycomicin will kill the algae and not leave a heavy metal residue (i.e. copper) in the pond, but it would have to probably be used a few times this year.

Manual removal of the algae is a way to remove excess nutrients in the pond too. If you kill the algae, and leave it in the pond, the nutrients are staying in the pond, continuing the cycle.


www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).