The only way to know for sure is to take some of the pond bottom dirt and send it in for a regular soil analysis. Take a water sample from the well and do the same. Typically new ponds don't have a bloom starting so fast. But, there's no way to tell from here without the tests being done.

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).